Clarence has a very very good point - air has more bouyancy than foam. foam is just one method of being a 'container' for air. bill - if you want i can take a picture of my M15 that has the original bow foam pieces in place. the space is also not filled ... and does still smell like the boat factory when the forward hatch is open (when the hatch and v-berth cushions in place i'm sure the smell is contained as i've never 'got that smell' unless i'm digging in the forward locker). david scobie M15 #288 (not yet named) "Clarence K. Andrews" <n9ca@comcast.net> wrote: There are some foams that, when burned, put out fumes that are deadly. Why not just use jugs that have screw caps and get the bouyancy using air? --------------------------------- Sucker-punch spam with award-winning protection. Try the free Yahoo! Mail Beta.