: Ethafoams disadvantages are that its compression properties are not as good
: as minicel and adhesives don't always stick to it well.

Good point Eric. Ethafoam is expanded polyethylene, the same material that plastic boats are made of, and we all know that nothing sticks to them worth a darn. It might be advisable to use small wood support blocks when glued to the hull and deck to keep an Ethafoam bulkhead in place, in addition to the adhesive/sealer.