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Re: crack in cockpit sole of Catalina 22, how serious?
One big heavy crew who jumps down into the cockpit of a small boat on a regular basis can crack it like that. Cockpit floors will flex and they're not meant to have big guys jumping down in them. So, that's all it takes.
Whether the floor is unsupported or has the usual plywood under it, the fix would be the same. From below, remove the plywood, add something stiffer (newer heavier ply, or stringers, or a sheet of G10 fiberglass board, and glass it in place. That leaves the cockpit side undisturbed, so all you have to do is recoat it. Fill the crack, apply antiskid over the floor, and you've got an invisible repair and a strong new floor under it.
Of course, getting good access under the cockpit floor without getting your hair full of epoxy may be a job best left to a trained monkey in a small hazmat suit.