I filled both the front compartments (under the cushion) and the rear area under the cockpit with pool noodles (closed cell foam) that I bought on sale at the end of the summer season. I can't say for sure that the buoyancy is adequate for my M15's 750 pounds plus another 400 pounds for two adults and equipment, but I pretty much filled up all the storage space she has! Ron C. ________________________________ From: Klaas <santaklaas@telus.net> To: Montgomery boats groups <montgomery_boats@mailman.xmission.com> Sent: Monday, February 27, 2012 6:28 PM Subject: M_Boats: Buoyancy I'm still working on my 15ft Monty and noticed that the old styrofoam is breaking up . That's in both the front and back areas , at the back there was just two small blocks about 8x10 inch by 1ft . I'm thinking of either filling the areas with some of the building foam in aerosol cans , or using sailing dinghy buoyancy bags . Anyone done either or have any ideas why one shouldn't do either Thanks in advance for any comments KLaas