In other words, is that final sanding … I like to keep things easy, and efficient. Always allow polyurethane to dry 24 to 48 hours before sanding, to give the surface time to … After this coat dries I repeat the buffing process and use 600 grit sandpaper to remove any burrs that may be felt. Sanding produces a white film over the finish, but will disappear as you apply the next coat. Follow up with 2 coats of undiluted polyurethane straight from the can. For additional water resistance and durability, you can add a layer of polyurethane, shellac, lacquer, or some other type of sealer. For example, when refinishing furniture with lacquer or polyurethane, silicone on the surface can cause the new finish to pull away from the contaminated spots—a condition called fisheye. Again wait for the primer to dry to give the coat another sanding. Apply a new coat of polyurethane over the area you sanded. Pencil Marks. 1. Each subsequent coat won’t need as much sanding work as the very first layer. When using water or oil based poly, how do you buff out the last coat? Use a clean foam brush to apply the polyurethane coating. Let dry 4-6 hours. Allow 3-4 hours dry time before you sand. I like how it looks after the last coat, with just a little bit of sheen, but I can feel the dust and brush marks with my hand. Choosing The Right Type Of Lubricant: Your options range from plain water to mineral spirits. After doing some research and talking to someone at Sherwin Williams, I decided to to use a water based oil modified polyurethane by MinWax. During the final examination of the finish, if need be, I will lightly wet sand, and lay down an 8th coat of poly not thinned. Our go to polyurethane for never having to sand between coats is Minwax Super Fast Drying Polyurethane For Floors*. This is a routine application. A poor sanding job will never look right no matter how much product you apply. Homer Homer. Then I hand rub in another coat of Tung Oil. Issue sanding between coats of polyurethane. I used a gel stain for color and then I have applied 3 coats of Varathane polyurethane with a satin finish. hardwood-floor sanding polyurethane hardwood-refinishing. For surfaces such as the floor, you can apply up to 3 layers. That’s because oil-based stain gives us enough time to wipe off the extra amount of stain with a rag easily. If this timing is followed, no sanding between coats is needed! Do not sand final polyurethane coat. This is not mandatory for oil-based stain. As you progress through your sanding, redraw the lines, and each time they all disappear, you can move to the finer grit. Using The Right Type Of Sandpaper: Wet sandpaper differs from dry sandpaper in that it does not fall apart when wet. 1.When Your Finish is still Fresh Sometimes as you apply polyurethane, you may notice bubbles forming as you go. Two axioms for furniture finishers are that you shouldn't shake the can before applying polyurethane and you shouldn't wipe the brush along the side of the can. I tend to use very fine sandpaper when doing the in between coat sandings. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush. Sanding Between Coats of Polyurethane. Ultimately, our recommendation is that you avoid sanding after staining or simply use a very gentle scuff sanding method if you notice roughness. Read Also: How to Sand Table Legs-In 7 Effective Ways [Like a Pro] Apply a primer to recoat the drywall coating=> Check on Amazon=> I do not use sandpaper on the second coat. Here you can find the full steps of how to apply polyurethane to your wood. Getting Rid of Bubbles In Your Dried Polyurethane Finish. This will ensure good adhesion of the succeeding coat. Polyurethane Stain. After final coat, allow 24 hours before normal use. This will ensure good adhesion of the succeeding coat. When applying polyurethane, brush along the grain, stretching the polyurethane into as thin a coat as possible. If You’re Using Wipe-On Poly. The final coat of polyurethane is then applied (third coat of "product" but only second coat of "poly"). share | improve this question | follow | asked Apr 21 '15 at 20:54. How to buff out last coat of polyurethane. Show Comments you may like. If it feels smooth to the touch, should it still be wet sanded with 600 or 800 grit, or can it be left as is?.. Apply a second coat following the directions above. Can you paint over polyurethane without sanding it first? Start by sanding the surface thoroughly and wiping it down to remove any dust. Both activities introduce bubbles into the mixture in the can, and it's likely that you'll transfer some of these to the surface you're finishing. If you’re dry sanding, wipe off the polyurethane sanding dust with a damp paper towel. Starting first with this Ranger that I repaired the cab corner on. I'd like to smooth out the surface before the final coat. What type of sander should I use: ... Random Orbit Floor Sander , or just a hand held orbital ? Apply a final coat of polyurethane within 48 hours of the previous coat. If the sanding was minimal, you can get away with just re-coating the sanded area. To the touch, it actually feels smooth (maybe i cleaned the dust up well between coats?). Final words: Should you Sand Between Coats of Stain? At this point you’re ready to either move on to a coat or 2 of wipe on poly, or you can skip that and start rubbing out the finish you want, which is covered below as well. I will know when it's enough by feel, I'll run my hands over the piece checking for 'rough' spots. I believe it's either bubbles or dust. Pretty much what the title says. I am currently using Minwax polyurethane satin oil based finish over some Minwax oil based stain. How do I apply a second coat of polyurethane? Continue following these steps for two to three times. You don’t have to sand between coats of poly as long as you get the next coat on within 12 hours – which means yes, sometimes you will be up at really strange hours coating yours floors with poly and your neighbors may wonder if you’re up to no good. If any blemishes or bumps are still seen, use the same sanding process to remove them. After a coat has dried, use 220 or 240 grit sandpaper or extra fine steel wool to lightly sand surface. If the finish “balls up” or seems wet, let it dry some more. Benefits of Polyurethane 309 1 1 gold badge 6 6 silver badges 13 13 bronze badges. Two stage paints require a base coat which is a color and finally a clear coat which provides the final shine and protection to the base color. I put on a final coat of water based polyurethane on some wood. NOTE: Before sanding, test on an inconspicuous part of the surface to ensure that the poly is completely dry. Apply two to three additional coats of full-strength polyurethane, sanding between each coat. For a better finish and perfect bonding between two layers of stain, the answer is yes. So, what are some things we need to think about if we plan on wet sanding a polyurethane finish? Step 5 Allow the polyurethane coating to dry for 24 hours. Create a homemade sealer by thinning the polyurethane with mineral spirits and use this for your first coat. A Final Thought. And the final layer won’t need any sanding at all (provided that it’s been spread on evenly). Both water-based and oil-based products give off strong fumes as they dry (although oil-based is decidedly worse), so proper ventilation is a must. However, it dries too fast for all the little laps and strokes to flow and level themselves on a top large enough for dining. How Do You Smooth the Final Coat of Polyurethane? But avoid using oil as a lubricant. I use medium steel wool on the second coat, and fine steel wool on the third coat. Do not sand the final coat. You will polish the final coat so as to give it an attractive shine. Then I'll hand rub in a third coat of tung oil. Sand the previous coats to make sure there is a perfectly flat and even base for the final coat. In case you are using oil-based polyurethane, please give it up to 24 hours of drying time before sanding and applying the subsequent coat. Brush marks often show up on pieces of furniture treated with polyurethane finish, usually despite the best efforts of the craftsman. Just don't finish your work outdoors, where you can't control dust, bugs, and other flying finish-ruiners. Sanding final coat of polyurethane? Sanding removes the lines and ridges created by the … 7 How Long Should I Wait To Apply A Second Coat Of Polyurethane? I prep sanded the wood using 80 grit and worked up to 220 grit. I am staining and finishing oak doors for the first time. Wipe off polyurethane dust with a soft cloth, then wipe with a tack cloth, and begin applying second coat. The biggest problem you can have is if your sandpaper is too rough. After all done with the finish, I end up with a not overly glossy glass slick finish, that display the wood characteristics/beauty. After your sanding is done with, you can then use a primer to recoat the drywall coating. In this case, applying a thin sealer coat of shellac (which isn't affected by silicone) separates the silicone contaminant from the topcoats. It can leave marks that will show through the finish. But if you have let the finish dry for more than 12 hours, sand the finish lightly with 220 grit sandpaper. What do you do after you apply the final coat of polyurethane to smooth out the imperfections? Sanding this smooth before the next coat will make the finish be smoother. Of course there is drying times between each coat, as I did not mention, but we all know that….hopefully. Then dampen a clean cotton cloth in water and rub automotive rubbing compound onto the surface in a circular motion -- the compound will remove any slight scratches left by the sandpaper. This is my first YouTube video!I've been building a trestle table for the last few months and this is the last step. Do not sand the final coat. Sanding produces a white film over the finish, but will disappear as you apply the next coat. My first problem is getting an even coat. Also, for polyurethane stain, you can use very light sandpaper. Choose the method that best works for you as you can brush, roll, or wipe. Final Coat Do not sand the last coat of polyurethane varnish. You can apply a second coat of polyurethane around 15 to 30 minutes after application. If you are sanding between polyurethane coats, always ensure that you use sandpaper of a very fine grit. So we “rub out” the final coat to make it smooth and flat. Sand the surface once more, then apply your final clear coat. However, there is a way to remedy these flaws without undoing a day's work. After drying, sand first coat lightly with 220 paper on a sanding block. Hi, I recently bought a Gerton Ikea desk top which I found out after was unfinished, and jumped through some hoops to get it so I decided I would try to finish it myself, even though I am in a small apartment. Polyurethane takes hours, not minutes, to dry; that's a lot of time for dust to settle or bugs to land on the surface, marring the final product. Always allow polyurethane to dry 24 to 48 hours before sanding, to give the surface time to cure and harden. After a coat has dried, use 220 or 240 grit sandpaper or extra fine steel wool to lightly sand surface. I just put on my 4th coat and despite meticulously sanding any bump and imperfections between each coats, a good amount of little lumps appear on each coat. So I sand that last coat, right? If you did extensive sanding, you might have to re-coat the entire wood surface with polyurethane. Then apply the next coat. Applying a coat of deglosser, also known as liquid sandpaper, can work in much the same way as sandpaper but without the need for all the sweat. They do not realize that there may indeed be another option. Semi-gloss products can differ in appearance depending on species of wood, sanding grit used and what sealer was used and if stain was applied. 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. When applying polyurethane, always brush in the same direction of the grain and spread the substance as thinly as possible. Many people would argue that sanding is the only real way to go when potentially painting over top of polyurethane. After this coat dries I just buff it with a cotton cloth. 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