Closed cell foam is not available here. The alternatives are:
1) Recover foam from the cutout (it seems to be in good shape), glue the bits with epoxy over a thin layer of glass and reuse. 2) Wood. Planks, ply or laminated are easy to find. Heavier. 3) Glass mat. Makes a thik solid laminate. Heavier. 4) Styrofoam (high density). The repair doesn't extend to the keel, it is mostly above the waterline and the boat is never moored. 5) Open cell polyuretane foam (insulation type)
6) Combinate two or more. Maybe a few wood (or glass) battens laid longitudinally, with strips of recovered foam between them?
I can buy a PVC foam plank, but if they can't be forwarded by plane, it'll take about three months to arrive (planks ship truck only, apparently). The foam appears to be 4 mm (5/32) thick, does this sound right? Brand and density unknown. Color is like sand - check the picture.
