Q: I bought some antique maple beech flooring 3/4 unfinished and put Duraseal on it. I think I made a mistake. I wanted the patina to come through. Can I apply an oil based sealer? With screening or not?
A: I think you will need to sand over, but if you are intent on now applying an oil based (polyurethane) sealer to the finish coat, absolutely screen. I don’t see what applying this way will accomplish however. The polyurethane sealer is meant to penetrate the wood, which it cannot do now that you have applied a poly finish coat.