Q: One visitor asked, "When there are air bubbles in the polyurethane finish on a newly refinished oak wood floor, can you spot sand some of them by hand and then touch up that spot with another coat of polyurethane?"

A: Very tough, if not impossible to totally blend such a spot in when using oil modified polyurethane. You may try buffing the entire individual board of the boards with fish eyes, and applying a thin coat of finish to those boards. Otherwise, you may have to re coat the entire room.