Ok, first off it's a 1982 (it was free so I took the donor's word for it). Figured it out. Make sure deck/hull seam is 100% free, remove cockpit drain including brass fitting, remove daggerboard rubber stop, ratchet block/strap screws, tilt boat carefully onto its side, wiggle it. Good thing I took the approach of a complete separation - water in flotation containers, completely soaked foam and plywood under deck and cockpit, worn out mast step, etc.. Going to 1- carefully remove the under-skin (Dremel to cut around the cockpit/trunk/step/etc.), 2-strip all the waterlogged foam and plywood out, replace with new plywood and Dow Blue rigid foam applied with Great Stuff and under plywood/weights), 3- Replace the plywood stringer under cockpit, 4- new blue between cockpit and hull, 5- glass around centerboard trunk base at hull joint, 6- re-assemble with epoxy+thickener for top of centerboard trunk, and great stuff around all the edges, 7- inspection port in deck to glass-in mast step, 8- fiberglass strip around the whole hull/deck joint. Thoughts? I'm sure there will be Great Stuff deniers out there, but it seems to me the best way to get a complete adhesion of foam-to-deck and hull/deck joint that won't crack and will fill all gaps.
