Polyurethane Finish Tip#1: Start With a Thick Coating Sand lightly with 240-grit sandpaper between coats, then let the last coat dry for at least 24 hours. This is standard practice with any wood finishing job, and is nothing out of the ordinary.Click to see full answer. Accordingly, do you sand after last coat of polyurethane?You shouldn’t have to sand the final coat. You apply the final coat, let it dry and you’re done. When you sand and rub out the final finish you take off most of the surface which contains the satin. If you are going to do that you might as well use a gloss finish.Also, how do you fix an uneven polyurethane finish? Sand the uneven finish using fine-grit sandpaper. Try not to sand too hard or you may go through into the stain, requiring that you re-stain the area. Wipe away dust and debris with a clean cloth. Apply a very light coat of polyurethane to the sanded area with a brush. One may also ask, can you apply a second coat of polyurethane without sanding? There is no substitute for sanding between each coat if you want the best finish. I get the best result building or refinishing furniture when I thin oil based urethane 3 parts urethane- 1 part mineral spirits for the first coat. Sand with 220 grit after first coat and wipe down with a tack cloth.What happens if you don’t sand between coats of polyurethane?Q: What will happen to a wood floor if you do not sand between coats of polyurethane? A: Nothing, provided you apply each coat of finish within a reasonable amount of time. 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.

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