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. Many people would argue that sanding is the only real way to go when potentially painting over top of polyurethane. Homer Homer. A Final Thought. Wipe off polyurethane dust with a soft cloth, then wipe with a tack cloth, and begin applying second coat. You can apply a second coat of polyurethane around 15 to 30 minutes after application. Always allow polyurethane to dry 24 to 48 hours before sanding, to give the surface time to … Then apply the next coat. Choosing The Right Type Of Lubricant: Your options range from plain water to mineral spirits. Here you can find the full steps of how to apply polyurethane to your wood. In other words, is that final sanding … I put on a final coat of water based polyurethane on some wood. Use a clean foam brush to apply the polyurethane coating. For a better finish and perfect bonding between two layers of stain, the answer is yes. 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?.. This will ensure good adhesion of the succeeding coat. For surfaces such as the floor, you can apply up to 3 layers. Starting first with this Ranger that I repaired the cab corner on. NOTE: Before sanding, test on an inconspicuous part of the surface to ensure that the poly is completely dry. This is not mandatory for oil-based stain. Final Coat Do not sand the last coat of polyurethane varnish. 1.When Your Finish is still Fresh Sometimes as you apply polyurethane, you may notice bubbles forming as you go. 1. I believe it's either bubbles or dust. How Do You Smooth the Final Coat of Polyurethane? When applying polyurethane, always brush in the same direction of the grain and spread the substance as thinly as possible. Ultimately, our recommendation is that you avoid sanding after staining or simply use a very gentle scuff sanding method if you notice roughness. Allow 3-4 hours dry time before you sand. 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. The biggest problem you can have is if your sandpaper is too rough. After this coat dries I repeat the buffing process and use 600 grit sandpaper to remove any burrs that may be felt. Just don't finish your work outdoors, where you can't control dust, bugs, and other flying finish-ruiners. 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. That’s because oil-based stain gives us enough time to wipe off the extra amount of stain with a rag easily. I use medium steel wool on the second coat, and fine steel wool on the third coat. Do not sand the final coat. 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. Apply a new coat of polyurethane over the area you sanded. Can you paint over polyurethane without sanding it first? As you progress through your sanding, redraw the lines, and each time they all disappear, you can move to the finer grit. 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. Always allow polyurethane to dry 24 to 48 hours before sanding, to give the surface time to cure and harden. If you are sanding between polyurethane coats, always ensure that you use sandpaper of a very fine grit. Sanding produces a white film over the finish, but will disappear as you apply the next coat. 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