Any permanent cure for the stress cracks above my cabin door?

No quick fix that I know of. Major surgery to support better is the only real answer. Stress cracks are a result of flex. Build to eliminate flex -- no more stress cracks. --- Jer

Depends on why you got the stress cracks. If it was due to poor construction in that area or flexing then you need ot adress that issue. Other times it can be that they put to much gell coat on or other issues and that can be fixed by sanding down to the bottom of the cracks and then spraying in the new gel coat. Good luck

Jon

Buy a new one and only use the boat on a small lake!