I refinished my sunroom’s hardwood floors. It used to be an open porch. When I applied the poly, I noticed swirls and scratch marks and decided to redo them again. The floors are now even, polished and without swirls, but some streaks of the poly I applied a few weeks ago are still showing—though faint. Will I make a mistake if I apply new poly over them?
At least complete a very light sanding and cleaning (400 grit or finer) or any imperfections will be magnified. As streaks I am guessing brush marks? This happens when poly is over worked. A light sanding and recoating can take out a lot of brush marks.
I regularly put down 3-4 coats and on things I want to look like glass many times that going up to 1200 grit, not a floor of corse but fine steel wool can also help but I prefer sandpaper when I want a true gloss.
Don’t overwork the poly put it down and don’t go back even 1 minute later or it may leave marks. Sanding and over coat hides brush marks but the surface needs to be prepped and multiple coats work even better.