Thanks Jim, but my basic question remains. I am new to fibreglass, epoxy, and gelcoat. All my other boats are skin on frame, SOF, Kayaks and sailing canoes. They have their issues with vinyl and hypalon hulls. So it seems that all boat designs have issues.

Why is Gelcoat used if it absorbs the water? Is it tougher than the fibreglass and resin? UV resistant? Lighter weight? Resists distorting under sailing pressure better than fibreglass?

Cheaper? Easier to repair? Can it be sealed? Is the absorption necessary, and sealing is counterproductive?

Lots of questions, Thanks for your help, TnT