Be careful about pressure buildup in enclosed spaces. I used it (spray foam) to insulate my garage door and bowed the surfaces of the door (I didn't care since I intend to install a solid door soon).

> Has anyone had experience with using foam sealants for floatation?
> I'm talking about the expanding type you can get in a can from marine
> supply houses. It's a waterproof, closed cell foam. I was thinking
> of putting it in the bow cavity of my stitch-n-glue kayak (under construction)
> to give the hull added strength, rigidity, and for floatation?

> Thanks for any information available.

> Jim Ward