What's your opinion??? I have a 1974 14' fiberglass trihull (Sears Gamefisher) that I am in the process of fixing(filling holes and big cracks with Bondoglass), but there are still some stress cracks all over the bottom of the boat. So I was thinking of either buying a Roll on do it yourself kit from the auto parts store, or just paying through the nose and having it sprayed. I know, that just adds weight to your boat. But it's only powered by a 6hp outboard so speed already doesn't exhist. My question is, should I have it on the inside of the boat, or the outside? Personally, I was thinking it prob. would seal better on the outside, and would be a little easier for me to do myself.