I have about a two inch crack on the bottom of one of my waverunners. I have repaired once with a marine-tex type product, but I want to build it up a little more. It is right at the point on the bottom that if you hit debris or floating log it might crack again. Can I use a bondo type product to build it up, it doesn't leak now I just want a little barrier incase I hit something or from rocks/bottom at lower water levels when switching people. Thanks