many videos on youtube on Gelcoat repairs. You can spray gelcoat with a Prevel and thin it down with acetone. many light coats is better and you need inhibit the air with pva glue. This washes off with water when cured.
i agree , you could sand the crack out with 600 wet and dry and re gelcoat after the cracks are removed.
I have rebuilt 5 J.s now you can visit www.hiyachtracing.com or www.codeyachtracing.com
contact me if you require more information
Regards
Peter
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