Re: fiberglass repair who been there and done that
The cracks will have to be ground down to the fiberglass thru the gelcoat. If you don't grind that far they will come back. Use a die grinder or roto-tool with a christmas tree shaped bit and follow the cracks for their entire length.Make about an eighth inch wide groove down to the raw fiberglass. Then clean them out and fill with a stromg fiberglass putty filler. I use a product called AD-Tech white filler. Then finish sand and either paint or gel coat back to the required finish. I can e-mail pic of the process. Hope this helps.
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