As noted before, I removed the slab of 1" green foam from the underside of my starboard cockpit seat. I assumed the foam was structural, but it has been suggested on another forum that the foam was for flotation. That makes some sense because a structural foam core on a small boat would not usually be 1" thick, but I am not aware that the M17 was ever touted as having positive flotation. The foam appears to have been factory installed before the deck was attached to the hull. Perhaps it was a custom option? Boat is a 1976, hull no. 215. Any insight would be much appreciated. ----- Original Message ----- From: "Stanley Wheatley" <swwheatley@comcast.net> To: "montgomery boats" <montgomery_boats@mailman.xmission.com> Sent: Sunday, April 6, 2014 8:51:51 PM Subject: M_Boats: Behold the carnage New to me M17 had delamination under the starboard cockpit seat due to some pretty big voids in the resin the core was supposed to be bedded in. Appears to be 1” foam core covered with 1 layer of 6 oz. fiberglass cloth. Any suggestions on what core I should use to replace it? I would prefer to use some kind of foam again but I’m not sure about the thickness. The available foam cores seem to thinner now days. Thanks.