Q: Can I put a satin polyurethane over semi gloss finish, on a hardwood floor?
A: Yes. As with all coatings, the finish will need to be thoroughly buffed to gain adhesion.
Related Q: Several months ago I refinished the hardwood floors in my bedroom with a polyurethane. I recently refinished the adjoining hallway, but could not remember what finish I used in the bedroom, so I went with semi gloss for the hallway. After seeing the 2 finishes side by side I now realize I used satin for my bedroom and the difference is obvious. I like the semi gloss look and was wondering if I can just put a coat of semi gloss over the satin in my bedroom to get them to match? What should I do?
A: Sure you can coat the other finish with any shine level you like. You will need to thoroughly abrade the previous coating first to make sure you get good adhesion. That means “scratching” the coating with a fine abrasive in the direction of the grain if you are going to rub it down by hand.