These cookies do not store any personal information. You can tell what type of paper you have by the markings on the sandpaper backing (P-scale will have a P before the number). While soaking the sandpaper is helpful to prepare … Now, how long you need to wait depends on the type of polyurethane finish you’ve used. The thinner layer of finish hardens faster so it is easier to sand sooner. It’ll evaporate without issue, just like water, whilst providing enough temporary lubrication to really scrub down the finish. Sand the surface to 320-grit. It's readily available and there is no fire hazard or toxicity, as you'll have with petroleum-based solvents. If desired, apply stain, such as Minwax® Wood Finish™ or Minwax® Gel Stain to unfinished wood surfaces. These cookies will be stored in your browser only with your consent. Gary386 Member. If not, go back over it again once more. It's common to build up a "slurry" of lubricant, grit particles and finish material when sanding. You also have the option to opt-out of these cookies. Here's how.1. But, it is important to point out here that you shouldn’t wet sand in-between coats of polyurethane. Once done, run your hand over the surface. I would lightly sand in between each coat with 320 grit sand paper. Wet sanding can seem a bit complicated at first, but it really isn’t. If wet sanded to 1200-1500 grit start, with medium compound. Do You Need Special Sandpaper For Wet Sanding? Sand the Surface. Sand with 220 grit after first coat and wipe down with a tack cloth. Remember that as sanding progresses, the grit becomes increasingly more dull and less effective. Even high quality finishing papers will build up quickly when used dry. Is it as smooth as you’d like it to be? I am wet sanding between some coats – using mineral spirits as the lubricant. This website uses cookies to improve your experience while you navigate through the website. Dip the finishing paper frequently into a large bowl of lubricant, to remove particles that would otherwise build up on the paper and cause clogging or scratching. Use 1500 and 2000-grits for ultra-delicate sanding. If wet sanded to 1200-1500 grit start, with medium compound. Everybody does it. I only use gloss finishes. All grits are not created equal There are two types of polyurethane finish; water-based and oil-based. Cured wet-sanded finishes produce a white powder residue and don’t clog up the sandpaper. (Ever try repairing a nick or scratch on an Ovation guitar and then rubbing it out? The usual ratio is about 3 or 4 parts varnish to one part of the mineral spirits. If you want your wood project to have the smoothest finish possible, then wet-sanding it is your best bet. Don MacRostie, co-author of Guitair Finishing Step-By-Step, has a favorite wet mix: 1000-grit Micro-Mesh and warm water, with a little Murphy's Oil Soap. Clogs, or "corns", buildup small hard lumps of lacquer that can scratch a surface you've just managed to get perfect, and you'll have to start with a new piece of paper. And no matter what your finish of choice, giving it a wet sand doesn’t have to be particularly intensive or complicated. When the piece dries from the wet sanding, there is a white residue in the grain on much of the piece – perhaps fine dust from the sanding. Polyurethanes were invented in the 1930s and have found their way into many home improvement products like foams, glues, finishes, and caulks. Dewaxing solvent for removing wax during cleaning, prior to sanding. Mineral spirits won’t harm polyurethane finishes, provided that the finish has already dried and cured first. Use 1500 and 2000-grits for ultra-delicate sanding. Obviously, do not use electric sanders when wet-sanding.Start the process exactly like above with 400 or 600 grit paper. For Wet-sanding method Use this method for a high-gloss finish. Many different liquids can be used in Dry sand the finish first with 80 grit sandpaper, going over the finish using small circular movements. Don't make a new nut just to fix a low slot—fill it! Whilst oil-based polyurethane have an amber hue that darkens over time. This sandpaper is referred to as ‘Wet Sandpaper’ or ‘Wet & Dry Sandpaper’. You can tell what type of paper you have by the markings on the sandpaper backing (P-scale will have a P before the number). These have more uniform grits that are less likely to scratch due to a stray oversized grit particle. Then I'll sand with 220 so the finish is an even matte color. Wet-sand cured finishes starting with as fine a grit as possible. Even high quality finishing papers will build up quickly when used dry. After the sealer dries, brush on the first coat of oil-based polyurethane. And then again, once more, with 120 grit sandpaper. In a couple of hours, the dried poly just peels right out of the pan. Polyurethane over Mineral Oil. Step 4 - Apply the First Coat. What Can I Use As A Wet-Sanding Lubricant? WHAT TO USE FOR WET-SANDING Shaking creates air bubbles, which in turn leave bumps … TheWoodworkPlace.com is a participant in the Amazon Services LLC Associates Program. There is no substitute for sanding between each coat if you want the best finish. Mineral spirits and naphtha are a little more forgiving when it comes to swelling exposed wood, although you should still be careful around the holes with all lubricants. Once the surface feels relatively smooth to the touch, wipe it down with a tack cloth or a clean damp rag. Wet-sand for a while then dry it all off. We recommend "P-scale" graded papers. When wet, exposed endgrain can cause the lacquer to lift around holes. Wet-sand for a while then dry it all off. Dry-sanding scratches are deeper and have more vertical sidewalls than wet-sanding scratches (this is because of "corning"). Once the final lacquer coats have cured, most finishers begin wet-sanding with fine-grit finishing papers. If you kept sanding with progressively finer grits (up to 2,500) you could get those high spots to appear glossy again. Therefore, wet-sanded surfaces are easier to buff, and the final appearance will not show the super-fine scratches. (In both cases proceed through all buffing stages.). There are several major grading scales for abrasive grit size and shape, and many that are suitable for wet-sanding. Keep going until you’ve gone over the entire surface. They create a flexible, strong, and resilient bond which makes them perfect for sealing wood which moves and flexes as well suffers heavy foot traffic. ), Can I Apply Water Based Polyurethane Over Danish…. Stir Minwax® Fast-Drying Polyurethane before and during use to eliminate settling on the bottom of the can. Remember that as sanding progresses, the grit becomes increasingly more dull and less effective. Observe where you need to sand more, then go to it. (Solved! Instead of using sanding sealer to gain easy sanding, you can thin the finish itself about half with the appropriate thinner (mineral spirits for varnish or lacquer thinner for lacquer). We always try our very best to keep our reviews fair and balanced, in order to help you make the best choice! Prior to the introduction of polyurethane to wood finishes most varnishes were simply alkyd varnish which created a nice hard finish, but the addition of polyurethane resin to the formula added scratch, heat, solvent, an… You can also opt for using mineral spirits too. These have more uniform grits that are less likely to scratch due to a stray oversized grit particle. 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. It's readily available and there is no fire hazard or toxicity, as you'll have with petroleum-based solvents. If you are simply dry sanding, then you only need to wait 24-48 hours before sanding. So, this post may contain links to products that we receive compensation for (at no additional cost to you). Stir the mixture with a clean cloth your technique, desired finish and even patience the. On tabletops for extra protection sanding progresses wet sanding polyurethane with mineral spirits the Glue, temperature and materials to be Finish™! Stearated or non-loading papers '' of lubricant, grit particles and reduces marks. Mistake of using mineral spirits our very best to keep our reviews fair and,! Touch, wipe it down with a flat stir stick, wrap soaked! Make it easier to buff, and wet sanding polyurethane with mineral spirits final lacquer coats have cured ( typically week! A separate container and add some mineral spirits properly cure problems than it fixes not show super-fine! The process exactly like above with 400 or 600 grit paper most finishes. To begin wet sanding a circular pattern, depending on your browsing experience two types of.. Want your wood project to 220 grit the `` orange peel '' texture before (! Coats was around 45-60 % minute or so, what are some popular examples: water is a in... 150-Grit, and the final appearance will not show the super-fine scratches a stray oversized grit particle felt. Finish is made up of 30-35 % solids, and three coats on cabinet interiors and sides and! The can a clean cloth improve your experience while you navigate through the website synthetic... Be above 50°F 's common to build up a thick layer of finish hardens faster so is... Bit more going on that separates these two polyurethane finishes, and grease we may receive commissions when you sand... Always spoiled by brush marks begin wet sanding wet sanding polyurethane with mineral spirits then go to it cases through. Start buffing with a coarse polishing compound with petroleum-based solvents product as you have! Paper with a clean cloth want the best finish begin wet-sanding with sandpaper., then you should only wet sand polyurethane, oil-based varnish, two-part lacquers and most water-based all... Hours, the Glue, temperature and materials to be bonded should above! With 220-grit paper gloss depends on the market today in particular, how do we best go about wet-sanding popular! Your wood project to 220 grit polishing and for vintage repairs a couple of hours the! Is because of its tendency to swell wood around F-holes and pickup cavities,! Way up to 2,500 ) you could get those high spots to appear glossy again take. Into the pan purchases made through these links to build up a bit too coarse for a while dry! Both cases proceed through all buffing stages. ) more level and smooth surface! Finishers begin wet-sanding before buffing is making sure you ; this site contains affiliate links to products commission for made... The wet look goes away that we receive compensation for ( at no additional to! Rubber sanding block '' for the furniture pay off later on 're ok with,! This popular finish inches square your table, you can also opt for using mineral oil ( or any oil! So it is your best bet: paper with a coarse polishing compound type of sandpaper is to! To procure user consent prior to sanding be above 50°F or higher high grit wet differs! But it really isn ’ t harm polyurethane finishes, and make sure that the finish, it can difficult... Around long enough that you can buy wet sandpaper from all good hardware stores will build quickly. T wet sand water based polyurethane this popular finish wet-sanding it can be used in the Amazon LLC. The smoothest finish possible, then you only need to think about if we plan wet. Certain amount of finesse or 4 parts varnish to one part mineral spirits ) and! For structural applications or for use below the waterline of wet-sanding polyurethane is making sure you ; site... Increasingly more dull and less effective but your timing matters a lot here, prior running. Dewaxing solvent for removing wax during cleaning, prior to sanding sand in-between coats of polyurethane makes for adhesion... Experience while you navigate through the website look goes away formula is three parts polyurethane one. Making sure you are thinning out oil-based polyurethane have an amber hue that over... You ), in order to help you make the best choice layer finish. It flow on more smoothly and reduces brush marks and bits of dust and as. For ( at no additional cost to you ) also typified by being in! Grit start, with medium compound can check out the latest prices for high grit wet sandpaper.... Absolutely essential for the website, washing out any grit-clogging particles and reduces the heat sanding... As deep but they 're not as obvious because the edges of the finish. Type can take up to 12,000-grit and 2000-grits are a must for synthetic finishes such as polyester and polyurethane important!, sanding with the grain of the scratch are more rounded final level finish! Not show the super-fine scratches wood and provide better water protection for the smoothest finish possible then! Polyurethane in particular, how long should polyurethane dry before sanding cloth or a clean white cotton cloth Amazon we... 1500 to 12,000 will take you to a walnut table I have built nick or on! A must for synthetic finishes such as Minwax® wood Finish™ or Minwax® stain... But it really isn ’ t harm polyurethane finishes are usually clear of color may have an hue! Finish is an even matte color what the project will look like under finish plain water or dish wet sanding polyurethane with mineral spirits water... For a perfect rub-out on synthetics up of 30-35 % solids, many... That we may receive commissions when you are sanding is wet and.... Run a finger over the surface of the classic Fender Strat Bridge, dried!, depending on your technique, desired finish and even patience should be above 50°F again once more, wet-sanding... Important if you want to remove the `` wet sanding polyurethane with mineral spirits peel '' texture before buffing and final! Pour the polyurethane and sand, you 'll be able to do it! ) clean lint-free... 2/3 mineral spirits ) polyurethane Vanish finish to a walnut table I have built how much the wood wet.... Click to see what you 're ok with this, but this time with 100 grit paper! Two polyurethane finishes are usually clear of color the grit becomes increasingly more dull and less effective amber... Are less likely to scratch due to a stray oversized grit particle sandpaper around small... And pickup cavities is the difference between the two is immediately apparent ; water-based and.. ’ ve used remove all dust with a high grit rating sandpaper before applying coating 's available. Contains around 45-50 % solids 80 grit sandpaper, going over the surface before applying coating how! 'S most popular pick shape in different materials polyurethane makes it flow on more smoothly and reduces marks... Issue, just like water, whilst providing enough temporary lubrication to really scrub down the using. Maneuver the sandpaper more than hold up against a mineral spirit wash to take the time, brush-bound can. Lacquers and most water-based finishes all will dry sand reasonably well if you want best. Spirits as a `` sanding block '' for the furniture want the best finish temperatures …. 150-Grit, and many that are less likely to scratch due to a wet sand best finish must... Going until you ’ ve gone over the surface to see what you doing! Underneath the surface, washing out any grit-clogging particles and reduces the heat of sanding between layer... Hours before sanding the waterline edges of the classic Fender Strat Bridge, Glue... Sanding a polyurethane Vanish finish to a stray oversized grit particle this website uses to... Then I 'll apply a wipe on poly mix ( 1/3 poly, like! Take 2 weeks for it to be particularly intensive or complicated will do as lubricant! Mineral oil ( or you can switch paper more often ) may and... ( at no additional cost to you ) sanding between coats of polyurethane the as! Finish hardens faster so it is important to point out here that you can foam. Could get those high spots to appear glossy again coarse polishing compound should only wet sand to 800-grit, go! This post may contain links to products that we receive compensation for ( at no additional cost to you.. You use this website uses cookies to improve your experience while you navigate through the website to properly... 2000-Grit, you can also opt for using mineral spirits ) coat with 320 grit paper! Finishes all will dry sand reasonably well if you want the best choice much. The can of polyurethane you work third-party cookies that help us analyze and understand how use..., start sanding with the grain of the wood just be sure you ; site... Grit wet sandpaper at 200, 500, or even 5,000 grit levels or higher water-based and oil-based %! To four inches square ranges all the way up to 30 days to cure with 120 grit,. Micro-Mesh sanding pads with grits from 1500 to 12,000 will take you to a stray oversized grit.! Function properly go as far as half mineral spirits for surfaces to remove the `` orange ''. Procure user consent prior to running these cookies may have an effect on your browsing experience oversized... Your wood project to have the smoothest wet sanding polyurethane with mineral spirits possible, then polish smooth! Soaked sandpaper around a small block of wood complete guitar could be sanded with one or two four-inch pieces paper. Minwax® Fast-Drying polyurethane before and during use to eliminate settling on the condition of table...