floatation question

What is everyones thoughts on replacing bow float bags with spray foam? I am thinking about this. Has anyone tried it? if so are there any drawbacks? Thanks for your thoughts.

try a search
for expanding foam. I think someone mentioned the most readily avalible stuff will saturate with water.

Heavier, will gro mold, will get
saturaded in time, can break a boat as it cures.

Get the darn float bags.