Sandy -- I had the exact same idea, having recently used a few cans of "Great Stuff" in a home project. It would fill up any shaped area completely with lightweight, waterproof foam. I can understand not wanting to waste valuable storage space with large blocks of styrofoam, but why NOT fill up those areas that cannot be used for storage -- what about inside the cockpit coamings, for instance? One downside might be the expense -- I'm not really sure what volume of foam you can get from one can, but I doubt it would be so large as a single cubic foot. On the other hand, this solution, if it worked, would be so elegant and so effective that it might be worth it. Steve M15 #152 Sandyal55@aol.com@mailman.xmission.com on 01/01/2002 11:20:54 PM Please respond to montgomery_boats@mailman.xmission.com Sent by: montgomery_boats-admin@mailman.xmission.com To: montgomery_boats@mailman.xmission.com cc: Subject: Re: M_Boats: Positive Floatation I don't own a monty and have no experience with positive flotation. I do have a suggestion as to how to add it however. If you opened up a heavy duty plastic bag inside an empty space on the boat and sprayed insulation foam from a can into the bag, The expanding foam would fill the space completely. The plastic bag would keep it from sticking to the hull and make cutting it out easier if needed. The plastic bag could be replaced with any container or shape that would suit your purpose such as making a cooler or storage space. Sandy