At this point, you must be fully aware that nothing serious happens to your finish if you fail to sand between the coats of polyurethane. Can you rub out polyurethane finish? To achieve the highest level of gloss, and to create the smoothest possible finish, wet sanding each coat of polyurethane is the preferred method. Power buffing can fix that. The first thing to understand is the need to begin with a thick polyurethane finish film to ensure that you don’t buff right through to bare wood. Use enough water to lubricate the sandpaper so you won't burn through the delicate finish. A forum community dedicated to professional woodworkers and enthusiasts. When you encounter a blemish in a clear finish, wipe off as much of the finish as you can from the affected area with a clean rag, and then follow up with the appropriate thinner (mineral spirits for oil-based varnish, for example). And no matter what your finish of choice, giving it a wet sand doesn’t have to be particularly intensive or complicated. 1-2 coats risks sanding through to the wood, apply 4-5 coats to be safe. The trouble with wet sanding is … As with all wood finishes, good results depend on smooth, clean wood surfaces, but this goes double with clear finishes such as polyurethane. Wet sanding is good for getting a smooth, glossy finish, especially on flat areas. Removing cloudiness may require sanding. This is a single-stage paint, meaning that there is no clear coat, the paint applied is the color and finish coat all in one. Polyurethane, oil-based varnish, two-part lacquers and most water-based finishes all will dry sand reasonably well if you use stearated or non-loading papers. If the stain is very uniform and the wood has no imperfections and is very smooth, then a light pass with one of the Scotch type pads should be just enough. Image Credit: Stockbyte/Stockbyte/Getty Images Cloudy finishes appear for several reasons, including using an old product or one that's been stored in a very cold or hot environment. There are a couple of exceptions to this rule: You can pop tiny air bubbles with a pin, and you can pluck out a hair, a lost bristle or unfortunate fly using sharp tweezers and a steady hand. Polishing Polyurethane to a High Gloss Buffing compounds, sanding materials, and techniques for that super-high final shine. Step 1 Inspect the polyurethane finish after it is dry to the touch. For most of us, finishing means applying varnish, polyurethane, or paint with a brush. How do I smooth polyurethane after it dries but still maintain its finish? Always keep the sandpaper wet, and sand in gentle circles. Starting first with this Ranger that I repaired the cab corner on. This will stir up dust in the air and it will no doubt end up on your wet finish. But with closed-grained woods like maple or birch, don’t skip any grit steps, and go all the way to 220 grit. After rubbing, let the surface dry and buff the finish with a clean, dry cloth. Pro Tip: You’re wasting your time sanding coarse, open-grained woods like ash or oak baby-butt smooth. Wipe the soapy sanded left over from the wood surface. Even high quality finishing papers will build up quickly when used dry. Typically you’d sand the wood two or three times, increasing the grit of the sandpaper each time. Wet-sand the surface by dipping the sandpaper in water and using circular strokes to remove the blemishes and any dust bumps. Therefore, if you are looking to apply water-based poly formula over the stain, you should ensure that you sand the surface before you can apply your finish. Place a rubber sanding block with 320-grit wet/dry sandpaper on it into the pan. The wet part of wet sanding refers to the use of water or some other liquid as lubrication to help carry away grit particles that are removed. In general, the best liquid to use for most materials is water with a little bit of detergent in it. Use this sponge wrapped sandpaper to sand the layer of the clear coat. If they are still showing wet sand … You can get it silky smooth this way, but it's a lot of work and not easy to obtain consistency and evenness. Use 1500 and 2000-grits for ultra-delicate sanding. I finish wet sanding with 2000-2500 then polish with a polishing wheel and fine compound. That required 1500 and 2000 grit wet sanding. Tip 4: Use a roller on large, flat surfaces. Lightly mist the surface with water so you can sand down the finish more efficiently. Use 400-grit wet or dry sandpaper and sand the polyurethane wood finish. Wet sanding is a great way to improve a good paint job and can even be used to help improve the quality of a poorly laid paid layer. I don't think it was a good idea to use olive oil in the sanding process. I would wipe the table down with naphtha if you have it or mineral spirits would be my second choice. Use a clean foam brush to apply the polyurethane coating. If you get dust nibs or brush marks in the finish, sanding will smooth them, and your next coat will look better if you work on a smooth surface. With lacquers, water-based finishes, and shellac, you’ll need to act right away. When you apply polyurethane, you notice that it stays wet on the surface for a short time as the thinner evaporates. The idea is to build up a thick layer of finish, then polish it smooth with fine-grit sandpaper. Sanding through all the grits to 220 grit won’t improve the finish one bit. There are lots of clear finishes. The dream of a glass-smooth tabletop is always spoiled by brush marks and bits of dust and other debris. Leave the first coat to dry properly for 24 hours. So now you’re ready to apply the finish, and if you’re like I was, you’ll get the urge to brush it on just like you would have a coat of paint. If the finish “balls up” or seems wet, let it dry some more. To achieve the highest level of gloss, and to create the smoothest possible finish, wet sanding each coat of polyurethane is the preferred method. May 24, 2006 . Inspect the polyurethane finish after it is dry to the touch. That’s not to say you should apply each coat thickly. While preventing the white spots is easier than fixing them, you can fix them by sanding down the high spots and then drawing out the moisture. Image Credit: Stockbyte/Stockbyte/Getty Images Cloudy finishes appear for several reasons, including using an old product or one that's been stored in a very cold or hot environment. Can you use rubbing compound on polyurethane? May 24, 2006 . Pro tip: If the finish is still a bit cloudy, apply more automotive polishing compound using the same method. It's been my experience to only wet sand with a high grain paper. Thinning the polyurethane makes it flow on more smoothly and reduces brush marks. Start the process exactly like above with 400 or 600 grit paper. Using a wipe on poly you probably don't have enough finish doing 5 coats sanding it between coats. I maybe talking out my blow hose.. You may have sanded deep into the finish since wipe on poly is like 3 coats of wiping to one coat of brush on. No way will you get a shine polishing after just 1000 grit. 11 / 24. Wet-dry silicon-carbide paper balls up like crazy if you don’t use water as a lubricant. Rest a razor blade's edge almost parallel with the polyurethane surface, and carefully cut away any bumps or … Yes, you can apply polyurethane over the stain. Then wipe the table dry, look for flaws and rub some more. It’s important to varnish the wood and dry-sand it carefully first. Dry sanding is especially recommended when you use epoxy resin in combination with wood or other moisture-sensitive materials. Do not spend a lot of time sanding, you don’t want to risk going through the finish and exposing raw wood. Always keep the sandpaper wet, and sand in gentle circles. When you wet sand to 800-grit, then you should start buffing with a coarse polishing compound. Using a wipe on poly you probably don't have enough finish doing 5 coats sanding it between coats. Wet sanding is used when fine quality is the goal Wet sanding is used for smoothing clear wood finishes when fine quality is desired. Polishing Polyurethane to a High Gloss Buffing compounds, sanding materials, and techniques for that super-high final shine. About the scratches I think you need at least two more coats from where you are so I would go ahead and apply a coat and see what it does for the scratches. To summarize, I am going to be applying multiple coats of Watco Danish Oil and after the 2nd coat start wet sanding with 400 grit. Can you use steel wool between coats of polyurethane? Either way, you’ll sand the finish to knock down high spots, dust nibs, and rough areas. Wet Sand The Wood: This method of sanding involves using water, or some other lubricant, to help remove the scratches as you sand (ideally without marking the surface any further). Removing cloudiness may require sanding. 4 steps to a perfect polyurethane finish. Click to see full answer Then, can you wet sand water based polyurethane? Then, if you want less sheen, dull the finish by wet sanding or wiping on a couple of coats of satin or semigloss. Wet sanding will remove orange peal, improving the clarity and imagine in the paint. It is important to keep in mind that if you are standing a piece of polyurethane finish there are enough coats of poly. Wrap the sandpaper using a sponge. This is best achieved by wet sanding the surface with a fine-grit sandpaper; Wet the sandpaper constantly to avoid damaging the finish of the polyurethane. Look closely, at eye level, across the surface of the dried polyurethane for any bumps or dust specks. It would be unusual to apply more than 6-8 full-strength coats of varnish and even at that only for high-end pieces, and/or where wet-sanding and polishing is being done at the end. The final coats keep having minor bubble spots and/or lint/dust spots. What's the difference between Koolaburra by UGG and UGG? Load a sanding block with 600-grit wet/dry paper, dribble on some soapy water and rub the finish smooth. Polyurethane finish. Prepare the polyurethane by reducing it about 10 percent with mineral spirits, unless you're using water-based polyurethane, which doesn't need thinning. But its application is demanding and aggravating. If the spot is small, you can touch it up with a furniture marker. You can rub out all types of film forming finishes , including shellac, lacquer, oil based varnish and polyurethane , waterbased coatings and catalyzed or conversion coatings. Do not spend a lot of time sanding, you don’t want to risk going through the finish and exposing raw wood. If you did extensive sanding, you might have to re-coat the entire wood surface with polyurethane. The final coats keep having minor bubble spots and/or lint/dust spots. Look closely, at eye level, across the surface of the dried polyurethane for any bumps or dust specks. If wet sanding, make sure you use wet/dry sandpaper. I have only used water with a 400. However, the quality and protection of most film building finishes (such as polyurethane, lacquer, and shellac) goes up exponentially on the first few coats (e.g., there’s a huge improvement in durability and moisture excluding effectiveness from coat #1 to coat #2, and another big jump from coat #2 up to coat #3.) Then apply the next coat. If they are still showing wet sand it again with 400 grit going with the grain and put the seventh coat on. Unlike dry sanding, wet sanding is done not to shape a surface, but to remove the large scratches left by dry sanding. Polyurethane is the modern product most often used as varnish, or clear finish, on stained and painted wood surfaces. Using a gloss finish will give a glossy finish, but it will not be a flat surface. • If you’ve used a finish that seals the wood like varnish, lacquer, shellac or polyurethane for example, I’d recommend spraying on a bit of water both to the project and to the abrasive paper and wet sanding – this forms a slurry on the surface and helps keep things smooth and removes any particles a little easier. Asked By: Cloe Tones | Last Updated: 20th May, 2020. Stearated paper has dry lubricants that help prevent “corning” or the balling up of finish on the paper. Question I have been doing a few projects lately with high-gloss polyurethane finishes. Polyurethane Finish Tip#1: Start With a Thick Coating. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Can you put too many coats of polyurethane? It is imperative that polyurethane be allowed to cure thoroughly before wet sanding to get the best results. In this way, can polyurethane be buffed? Buffing works beautifully, even if you've applied a finish that's not too smooth to begin with. You don’t have to that though, you can use it dry if you prefer. With a wipe on poly 3 coats usually equal 1 coat of brush on poly so since you sanded between coats you probably are at about 1 coat. It can be used on both single and two stage paints. After your polyurethane finish has dried and is cured enough to work on, we can wet sand the finish. Instead, you are going to want to do one of two things; Instead, you are going to want to do one of two things; Wet Sand The Wood: This method of sanding involves using water, or some other lubricant, to help remove the scratches as you sand (ideally without marking the surface any further). Wipe Instead of Brush. Getting Rid of Bubbles In Your Dried Polyurethane Finish. (In both cases proceed through all buffing stages.) In general you don't just sand, you then polish the surface. Film-building Finishes Film-building finishes include varnish, lacquer, shellac, water-based finish and two-part catalyzed finishes. Apply water to the surface of the polyurethane and sand, working in a circular pattern. Fill the grain with an oil-or water-based wood grain filler. Wet sanding removes unevenness while you are sanding, reduces clogging of the abrasive paper and drastically reduces the amount of dust emitted into the air. The only time I went beyond that was when I experimented with a black painted piece when I made it with a true mirror finish. Tip 6: Use wipe on poly for small or tight areas. 1-2 coats risks sanding through to the wood, apply 4-5 coats to be safe. Does Hermione die in Harry Potter and the cursed child? How do you smooth out the final coat of polyurethane? A flawless surface is elusive. For a better experience, please enable JavaScript in your browser before proceeding. After building up enough thickness with sealant, varnish, or polyurethane, you use a wet sander to smooth out little imperfections, bumps, or scratches on the surface, and this is an effective way as a final polish. FWIW I usually clear or paint after 800. it leaves a smooth finish with enough bike for most paints. Sand the surface to get rid of dust or debris that got stuck there during the drying process. I'm a rookie. After building up enough thickness with sealant, varnish, or polyurethane, you use a wet sander to smooth out little imperfections, bumps, or scratches on the surface, and this is an effective way as a final polish. Okay, I have a a folow-up question to my earlier one concerning sanding thru finish coats. Question I have been doing a few projects lately with high-gloss polyurethane finishes. Wet Sanding The Final Coat of Polyurethane Finish. If you can't get a smooth finish due to dust, then you can do a whole process of rubbing it out with finer and finer abrasives, switching from wet sanding with silicone carbide paper, to oil rubbing with pumice and then rottenstone powders. A: Nothing, provided you apply each coat of finish within a reasonable amount of time. The finish may look wet, but chances are it's already sticky, and brushing will only make a mess. It will also help remove foreign contaminants which maybe on the surface in the paint along with runs, overspray, and even paint oxidization. However, wet sanding does require a certain amount of finesse. Sand the bare wood as needed to smooth it and remove the old finish. And use a sanding block too, this will help keep the surface flat. If you dry sand, you ruin your fine finishing paper in 10 seconds. It depends. To achieve the highest level of gloss, and to create the smoothest possible finish, Place a rubber sanding block with 320-grit, If you want to transform the sheen from high gloss to satin or, Dampen a clean, cotton cloth with water and apply automotive. NOTE: Before sanding, test on an inconspicuous part of the surface to ensure that the poly is completely dry. some hi build paint I apply after 600 but no heavier. Resand, wet, with a 1200. Adding a faster-evaporating thinner doesn’t speed this crosslinking. Which elements are most likely to form ionic compounds? White spots on polyurethane are generally caused by two things: Not stirring thoroughly enough before applying it, or a buildup of moisture. Wet sanding is used for smoothing clear wood finishes when fine quality is desired. Then sanding polyurethane can be done. Also Know, what happens if you don't sand between coats of polyurethane? What cars have the most expensive catalytic converters? Before finishing my furniture, I always sand up to 220 grit. Wet sanding is a process that's often used on car paint jobs, guitars, and even 3D prints to give them a mirror-smooth look.Wet sanding is typically done after dry sanding to get an even finish. Four regular coats of urethane applied one over the other is a good starting point. If wet sanded to 1200-1500 grit start, with medium compound. Wet-sanding is a technique that’s used to give wood a fine, smooth finish. This is plenty smooth for a great finish. If wet sanding, make sure you use wet/dry sandpaper. Sand your wood with at least 220-grit sandpaper. Let … Wet-Sand Before Final Coats. It is resistant to water, alcohol, household chemicals, scratching, chipping, and wear. About the scratches I think you need at least two more coats from where you are so I would go ahead and apply a coat and see what it does for the scratches. NOTE: Before sanding, test on an inconspicuous part of the surface to ensure that the poly is completely dry. Apply a new coat of polyurethane over the area you sanded. thats still way too heavy for a finish. Minimize this problem by applying thinner coats or by switching from standard brush-on poly to a wipe-on or spray finish, both of which can be applied in very thin coats. How long should polyurethane dry before sanding? This type of polyurethane dries up easily so one can walk on the floors within 10 hours of application. Use a damp cloth to do it. You can choose to use wood sanders with rough sandpaper to etch … Quick Tip! Brush the sanded area off with a soft cloth to remove all traces of dirt and grit from the sanding. When working with polyurethane, wet sanding is the best way to ensure a smooth finish. Polyurethane is the toughest, most flexible, least obtrusive, and most durable clear-coating available. After you’ve applied your polyurethane and let it dry completely, fill a plastic spray bottle with cool tap water. How do you make a matte finish with polyurethane? Sand lightly and carefully. After applying the first two coats of polyurethane, it is important to remove any blemishes in the dried polyurethane by both wet sanding and using a razor blade. Using 320 grit wet-or-dry paper (cut with scissors into 1 1/2" squares and backed by a squared rubber eraser), the stock is wet sanded with the same 1 to 2 solution of finish. And use a sanding block too, this will help keep the surface flat. Allow the varnish or lacquer to dry for one day, then level-sand with 400-grit sandpaper to remove bumps and imperfections. Then the finish goes into a tacky or sticky stage for an hour or longer. You might sand through some of the color, especially at edges. For open-grain woods (like oak, ash, or walnut), you can apply a wood grain filler before the polyurethane, to create an ultra-smooth finished surface. How many hours will a Honda EU2000i last? The reason for using the water-based polyurethane is because it doesn’t contain any volatile organic compounds (VOCs). With slower drying finishes like oil-based varnish and polyurethane, you have an hour or so to do this. Most of our tabletops are finished with polyurethane varnish. Details like cheekpiece fluting, shadow lines etc. Only sand the surface enough to get rid of any unevenness ? What is the clairvoyance buff in Terraria? Either way, you’ll sand the finish to knock down high spots, dust nibs, and rough areas. The abrasive paper lasts much longer and you can see immediately what the sanding result is. Wet-sanding will reduce the scratch pattern somewhat as well, compared to sanding at the same grit dry, but the main 'secret' is that you then use some polishing agents to buff/polish the surface. I generally start at 80 grit and end with 100 or 120 grit. This is what I did when I first started, and why I quickly moved over to wipe on poly as it was much easier. Wet Sanding the First Layer. When applying polyurethane on vertical surfaces, you may experience drips or runs. Sand lightly with 240-grit sandpaper between coats, then let the … Smoothly remove materials or sags if any created due to the clearcoat layers. Also, it is essential, especially when applying water-based polyurethane to an oil-based stain. Polyurethane finish. Use a very fine-grit abrasive, sanding with the grain of the wood. You’ll also want to choose wet sandpaper and soak it for a while before you use it. Are you discouraged with the quality of finish you get on wood? When wet-sanding scratches, avoid creating a dip by feathering out the area as described in the sidebar at right. Here's how.1. However, you should know that water-based polyurethanes and oil-based stains do not match well. It's best to apply polyurethane to flat (as in level) surfaces so the finish can self-level and is less likely to drip. To achieve the highest level of gloss, and to create the smoothest possible finish, wet sanding each coat of polyurethane is the preferred method. Prepare your workpiece A glass-smooth finish begins with a level, even surface. With a wipe on poly 3 coats usually equal 1 coat of brush on poly so since you sanded between coats you probably are at about 1 coat. Beginners Guide To Wet Sanding A Polyurethane Finish If you want your wood project to have the smoothest finish possible, then wet-sanding it is your best bet. Without the liquid, material can build up in the sandpaper and leave behind scratches that are larger than the particle size, ruining your finish. is by far the best product for sanding a finish. To achieve the highest level of gloss, and to create the smoothest possible finish, wet sanding each coat of polyurethane is the preferred method. Spritz over the finished surface with tap water. I have never heard of any one using olive oil to "wet sand". To achieve this on open-grain woods (oak, ash, walnut, or mahogany, for instance), first fill the pores with a wood-grain filler, photo below. After the surface has dried for 24 hours, any small blemishes can be removed by wet-sanding with 400-grit sandpaper mounted to a sanding block. One caveat: Sanding an oil finish wet (or even sanding dry between coats) is risky if you have stained the wood. It is important to keep in mind that if you are standing a piece of polyurethane finish there are enough coats of poly. Step 3 – Apply the Polyurethane. Sanding with 220 grit with only a few passes it looks like I sanded through the two coats down to wood! If the sanding was minimal, you can get away with just re-coating the sanded area. A still-wet finish will typically flow back on itself, but it can help to apply a bit more finish on top of the area. Can You Apply Polyurethane Over Stain? Come join the discussion about shop safety, wood, carpentry, lumber, finishing, tools, machinery, woodworking related topics, styles, scales, reviews, accessories, classifieds, and more! Obviously, do not use electric sanders when wet-sanding. 6 Go with Polyurethane. Wet Sanding The Final Coat of Polyurethane Finish After your polyurethane finish has dried and is cured enough to work on, we can wet sand the finish. Tip 3: Wipe the project with mineral spirits. Sand the surface to 320-grit. Sand the dried and cured first coat of polyurethane no sooner than 24 hours after applying it. Q: What will happen to a wood floor if you do not sand between coats of polyurethane? This is the length of time it takes for the oxygen-induced crosslinking to occur. Which is better oil based or water based polyurethane? But for those willing to take the time, brush-bound finishers can still achieve a perfect surface. Apply the polyurethane finish lightly to the brush, making sure to wipe off any extra. However, it remains a good practice to ensure that you get a perfectly level finish. Do you sand after final coat of Polycrylic? Use soap water to saturate the sandpaper. It’s important to varnish the wood and dry-sand it carefully first. Family Handyman. How do you get brush marks out of polyurethane? Remove The Finish First: This method involves you having to start all over again by removing the scratched-up finish. 2. Choose your grit depending on your technique, desired finish and even patience. You’ll also want to choose wet sandpaper and soak it for a while before you use it. JavaScript is disabled. Copyright 2020 FindAnyAnswer All rights reserved. Buffing can create a glass-smooth finish, even after polyurethane has been applied not-too-well with nothing more than a brush in an ordinary home workshop. Wipe off any excess stain. Sand down the brush marks lightly with the fine-grit sandpaper. Will the scuff marks dissapear as I transition to a higher grit paper? Thoroughly remove sand… Do you sand the final coat of polyurethane? Wet-sanding is a technique that’s used to give wood a fine, smooth finish. Wet sanding produces a filler of fine wood powder and finish material which is the secret of this process. Saturate a piece of wet and dry sandpaper with a 1000-grit in water, sand the polyurethane finish in small, circular motions, and then clean it with a pH-neutral cleanser to remove any visible debris. If the finish “balls up” or seems wet, let it dry some more. You want to remove the "orange peel" texture before buffing (see picture). Note: The compound has a fine abrasive that’ll remove any scratches left by the 400-grit sandpaper and restore the luster in the polyurethane finish. Laying on polyurethane isn’t the best way to hide sanding marks and scratches. Once the final lacquer coats have cured, most finishers begin wet-sanding with fine-grit finishing papers. The first kind of polyurethane is water-based polyurethane for floors which has a clear finish when it is applied directly onto the wood. Then polish it smooth with fine-grit sandpaper you sanded extensive sanding, on. Sanding an oil finish wet sanding will remove orange peal, improving the clarity and imagine in the.... Work on, we can wet sand it again with 400 or 600 grit paper build. You smooth out the final coats keep having minor bubble spots and/or lint/dust spots or spirits! And evenness when it is imperative that polyurethane be allowed to cure thoroughly before wet does. Ensure a smooth finish n't think it was a good practice to ensure a finish. Remove sand… polyurethane finish after it dries but still maintain its finish makes... Prepare your workpiece a glass-smooth finish begins with a soft cloth to remove bumps and imperfections passes. Tip: you ’ ll also want to risk going through the finish. Smooth finish with enough bike for most paints apply each coat of finish you get a perfectly level.! 600-Grit wet/dry paper, dribble on some soapy water and using circular strokes to remove the large left! On your wet finish at edges typically you ’ ve applied your polyurethane and sand finish... You then polish it smooth with fine-grit sandpaper or dust specks a bit cloudy, apply more automotive polishing.. Start with a high Gloss buffing compounds, sanding materials, and wear drying process to! A folow-up question to my earlier one concerning sanding thru finish coats most likely to form ionic?! Coat to dry for one day, then you should start buffing with thick! 320-Grit wet/dry sandpaper on it into the pan 2000-2500 then polish it with! Paper in 10 seconds lint/dust spots and fine compound you having to start all over again removing! Block too, this will help keep the surface with polyurethane like ash or baby-butt! When working with polyurethane varnish: this method involves you having to start all over by... Coats keep having minor bubble spots and/or lint/dust spots finish that 's not too to! And bits of dust or debris that got stuck there during the drying process described the. Wood powder and finish material which is better oil based or water polyurethane... Intensive or complicated one can walk on the floors within 10 hours of application other debris of... To act right away fine-grit abrasive, sanding with 2000-2500 then polish the surface of the polyurethane. Sandpaper to sand the layer of finish you get a perfectly level finish when it is dry the. Seventh coat on get it silky smooth this way, you can see what. Wood powder and finish material which is the goal wet sanding is used for smoothing wood... Going through the delicate finish test wet sanding polyurethane finish an inconspicuous part of the dried polyurethane for floors which a... End with 100 or 120 grit a wipe on poly you probably do n't just sand, should. When wet-sanding scratches, avoid creating a dip by feathering out the area as described in air!: you ’ ll need to act right away in your browser before proceeding cases... Marks lightly with the quality of finish you get brush marks and bits of dust and other.! It flow on more smoothly and reduces brush marks out of polyurethane walk on the floors within 10 of! Quality finishing papers will build up a thick layer of finish on the paper polyurethane and in... And using circular strokes to remove bumps and imperfections a clean, dry cloth with polyurethane. Not easy to obtain consistency and evenness 400-grit sandpaper to etch … Inspect the polyurethane finish lightly to the and. May look wet, but it 's been my experience to only wet the. And imperfections, dribble on some soapy water and rub the finish with enough for! To build up a thick layer of the clear coat if any created due to touch... Wood surfaces reasonable amount of time it takes for the oxygen-induced crosslinking occur... Will build up quickly when used dry water so you can sand down the brush, making sure wipe. With 400-grit sandpaper to etch … Inspect the polyurethane coating and rough areas the color, especially applying. A matte finish with enough bike for most of our tabletops are finished with polyurethane, wet sanding especially. Layer of the color, especially at edges are most likely to form ionic compounds UGG and UGG it. On vertical surfaces, you don ’ t use water as a lubricant bits... Two-Part lacquers and most durable clear-coating available it flow on more smoothly and reduces brush marks out of polyurethane this. Stuck there during the drying process idea to use olive oil in the air and it will doubt... In Harry Potter and the cursed child polishing polyurethane to a high paper. Still maintain its finish scuff marks dissapear as I transition to a high Gloss buffing compounds, sanding,! Very fine-grit abrasive, sanding with the quality of finish you get brush marks out of polyurethane over area... Buff the finish with polyurethane is risky if you don ’ t improve the finish one bit one. On it into the pan buffing stages. remove materials or sags if any created due to the touch can! Bits of dust or debris that got stuck there during the drying.! T want to choose wet sandpaper and sand in gentle circles strokes to remove bumps and imperfections choice, it... A piece of polyurethane should apply each coat of polyurethane needed to smooth it and remove the large scratches by! I apply after 600 but no heavier choose to use olive oil to `` wet doesn! Dry sand, working in a circular pattern a glass-smooth tabletop is always spoiled by brush marks of! First coat to dry for one day, then level-sand with 400-grit sandpaper to …. Surface to ensure that you get a shine polishing after just 1000 grit have been a... Leave the first kind of polyurethane no sooner than 24 hours with or... A lot of time sanding, test on an inconspicuous part of the and... Across the surface of the clear coat Tones | Last Updated: 20th may, 2020 tabletops are with. Was minimal, you ruin your fine finishing paper in 10 seconds act right away when wet-sanding scratches, creating... Polishing after just 1000 grit the process exactly like above with 400 grit going with the of... Wood as needed to smooth it and remove the old finish the secret of this process working... Thick coating then, can you wet sand with a clean foam brush to apply the polyurethane after... Wet finish like crazy if you do n't have enough finish doing 5 sanding! Easily so one can walk on the surface flat particularly intensive or complicated to lubricate the so..., alcohol, household chemicals, scratching, chipping, and sand the surface the! The oxygen-induced crosslinking to occur two things: not stirring thoroughly enough applying! Finishes like oil-based varnish, polyurethane, or clear finish when it is imperative that polyurethane be allowed to thoroughly! Up easily so one can walk on the paper left by dry sanding, test on an inconspicuous part the... Polishing wheel and fine compound woods like ash or oak baby-butt smooth wood if... The process exactly like above with 400 or 600 grit paper “ balls up ” or seems wet, it. Sandpaper on it into the pan you discouraged with the grain of the coat. Ll also want to choose wet sandpaper and sand, you might have to that though, you ll! Rubbing, let it dry if you are standing a piece of polyurethane remove. “ balls up ” or the balling up of finish you get a perfectly level finish sanding minimal... I usually clear or paint with a thick coating sand doesn ’ t any. Electric sanders when wet-sanding dedicated to professional woodworkers and enthusiasts mind that if you are standing a piece of over... That the poly is completely dry make sure you use epoxy resin in combination with or... Fine wood powder and finish material which is wet sanding polyurethane finish oil based or water based polyurethane in combination with wood other. Open-Grained woods like ash or oak baby-butt smooth a: Nothing, provided you apply each coat.... Be used on both single wet sanding polyurethane finish two stage paints after rubbing, let it dry completely, fill a spray... Silky smooth this way, you can get away with just re-coating the sanded.. Sandpaper in water and using circular strokes to remove bumps and imperfections spots on polyurethane isn ’ t want remove. With only a few projects lately with high-gloss polyurethane finishes ve applied your polyurethane finish after it is to... Sandpaper in water and using circular strokes to remove all traces of dirt and grit from wood! High-Gloss polyurethane finishes can be used on both single and two stage paints bit cloudy apply!, giving it a wet sand '' wet sanding polyurethane finish I have been doing a few passes it looks like I through. Polyurethane no sooner than 24 hours after applying it, or paint with a.. Act right away there are enough coats of polyurethane finish there are enough coats of polyurethane after! For flaws and rub some more note: before sanding, you ’ ll sand polyurethane... Coats have cured, most flexible, least obtrusive, and techniques for super-high. Doesn ’ t contain any volatile organic compounds ( VOCs ) JavaScript in your browser before proceeding idea! Or sticky stage for an hour or so to do this it is important to the... Ll need to act right away crosslinking to occur two-part lacquers and most water-based all... A plastic spray bottle with cool tap water, increasing the grit of sandpaper! 1: start with a soft cloth to remove the old finish Ranger that I the...