If you are sanding between polyurethane coats, always ensure that you use sandpaper of a very fine grit. I tend to use very fine sandpaper when doing the in between coat sandings. Wipe off polyurethane dust with a soft cloth, then wipe with a tack cloth, and begin applying second coat. hardwood-floor sanding polyurethane hardwood-refinishing. Our go to polyurethane for never having to sand between coats is Minwax Super Fast Drying Polyurethane For Floors*. If the finish “balls up” or seems wet, let it dry some more. Apply two to three additional coats of full-strength polyurethane, sanding between each coat. Apply a final coat of polyurethane within 48 hours of the previous coat. I will know when it's enough by feel, I'll run my hands over the piece checking for 'rough' spots. Continue following these steps for two to three times. Use a clean foam brush to apply the polyurethane coating. Just don't finish your work outdoors, where you can't control dust, bugs, and other flying finish-ruiners. Pencil Marks. Final words: Should you Sand Between Coats of Stain? Of course there is drying times between each coat, as I did not mention, but we all know that….hopefully. 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. After final coat, allow 24 hours before normal use. Let dry 4-6 hours. Do not sand final polyurethane coat. 309 1 1 gold badge 6 6 silver badges 13 13 bronze badges. Also, for polyurethane stain, you can use very light sandpaper. Here you can find the full steps of how to apply polyurethane to your wood. After drying, sand first coat lightly with 220 paper on a sanding block. So, what are some things we need to think about if we plan on wet sanding a polyurethane finish? Sanding Between Coats of Polyurethane. After doing some research and talking to someone at Sherwin Williams, I decided to to use a water based oil modified polyurethane by MinWax. Benefits of Polyurethane After a coat has dried, use 220 or 240 grit sandpaper or extra fine steel wool to lightly sand surface. 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. If the sanding was minimal, you can get away with just re-coating the sanded area. As you progress through your sanding, redraw the lines, and each time they all disappear, you can move to the finer grit. 1.When Your Finish is still Fresh Sometimes as you apply polyurethane, you may notice bubbles forming as you go. My first problem is getting an even coat. If you’re dry sanding, wipe off the polyurethane sanding dust with a damp paper towel. I use medium steel wool on the second coat, and fine steel wool on the third coat. And the final layer won’t need any sanding at all (provided that it’s been spread on evenly). You can apply a second coat of polyurethane around 15 to 30 minutes after application. Choosing The Right Type Of Lubricant: Your options range from plain water to mineral spirits. This is my first YouTube video!I've been building a trestle table for the last few months and this is the last step. 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=> Do not sand the final coat. 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. This will ensure good adhesion of the succeeding coat. After all done with the finish, I end up with a not overly glossy glass slick finish, that display the wood characteristics/beauty. 7 How Long Should I Wait To Apply A Second Coat Of Polyurethane? 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