[quote=Dogboy]First question - are you sure the fiberglass is cracked? The outer surface of the comptip is a layer of resin that can develop cosmetic cracks that aren’t a structural concern and wouldn’t need any repair.
If the fiberglass itself is cracked, then it’s really matter of the size and location of the crack. I fixed a cracked Hobie 18 comptip a few years ago by patching it similar to what you described, and it held up just fine. The comptips are pretty robust, but depending on the crack’s location, it could be an issue.
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