I have a 16' Willie, I have never applied Coat-it to the bottom of it since it had Coat-it from the factory. I was looking under it the other day and I noticed that it was flaking off in a few spots and looks like it needs 1-2 new coats. My question is How many coats should I apply, and How many coats can a can cover. At 30-40 bucks a can I dont want to buy to much. I will probably need to sand since it doesnt look like the manufacture prepped the bottom very well the first time (flaking in spots). Any suggestions on what to do?