Tigerdude,
Chances are that you're getting in a hurry and trying to move too fast. If the edges pulled away when you were trying to shrink the rest of the covering then you didn't get them adhered good enough. As I said in my LT-40 build thread, covering with Monokote isn't hard to do at all, it just takes time to do properly. 9 times out of 10 people that wind up with poor results are just getting in a hurry and don't want to take the time to do it properly.

Ken