Join Date: May 2006
Location: Left Coast USA
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Gelcoat cracks are common on some boats. It is important to understand why they are there.
#1. Old boats tended to have really thick gelcoat which will crack just because of temperature changes.
#2. Stress cracks caused by flexing from improper support, like near chainplates or genoa tracks.
#3. Star cracks are generally caused by an impact.
Gelcoat is brittle and it doesn't take much for it to crack. So, what do you do with them? Difficult question, I have had poor results in just trying to fill them. I think you can probably ignore most of them. But if you want the boat to look like new you will need to grind them down to glass and reapply gelcoat or paint the boat. Either way you would need to remove the cracks, not just fill them.
Hopefully someone on the list has had better results with less effort.