i pulled the old trainer out of storage today and i am pissed, i have 2 holes in the main wing section[] thank god there is no damage to the frame, but i am going to have to re-coat the wings. i have never used this stuff b4 but after a few lessons from youtube i recon i could do it. i just have one question, do i have to pull the old coating off first, or can i just stick the new coating straight over the top of the old stuff? thanks in advance