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Yes....the core of a surfboard is foam. But the skin of a surfboard (top & bottom) is 3 to 5 layers of 4-6oz fiberglass cloth and layers of polyester or epoxy resin. Also there would be 1 to 3 , 4-6mm wooden stringers reinforcing the foam. Granted some stringers are balsa.....
4mm plywood is not much thicker than your average cardboard box.I dont see a night & day difference between the skin of a surfboard and 4mm of plywood. I have repaired surfboards in the past but have no experience building wooden kayaks so perhaps the wooden kayak builders could chime in here.....
I still cant help but think that a 15ft GWS could have obliterated this kayak if it wanted to....
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