I recently got a boat for free (nothing is free) and it had a hole (or more of a crack in it) the crack is about 2 feet long and about 1/2 an inch wide. I sanded the boat down about a 1/4 of an inch. I placed fibergass sheets on it and resin till it was built up about 1/2 an inc higher ten the boat. After letting it sit for 2 days, I took it for a 2 hour drive. When I pulled it out of the watter the repair had cracked and the new glass was showing. There is no access to get it from the inside. Wanted to know if i did anything wrong, or if there is a better way to fix it. THere is also alot of flex in that are of the boat. Any Ideas will help thats so much.