My husband and I bought all new unfinished kitchen cabinets. They are oak. I bought a colored stain. Since they are oak, they don't absorb a whole lot of stain, but that's okay. But when it comes to applying the polyurethane, is a foam brush okay our should I stick with a regular brush? Also how many coats of finish should I apply? 2 or 3? I understand that with each coat I need to let it dry 4-6 hours and with the final coat, it says 24 hours. Also, why do we need to sand between each dry coat? If anyone has done this before and has some helpful hints, I would appreciate it!