Definitely read up on the Mar-K info; it'll sorta be hindsight at this point, but it's great information.
Also, depending on humidity, definitely wait overnight or longer on each coat of the urethane. As long as you give each coat plenty of drying time, Lightly sand it down (you can switch to very fine steel wool, or a 400+ grit paper), and wipe it clean I suppose you could put as many coats on as you'd like.
I always get a better finish using very fine steel wool prior to the next to last coat, and cheese cloth or the inside of blue jean material prior to the last coat.
Brad
