Hi All, I must say, we have been thinking of foaming bilges for a while also. We typically foam 6" to 1' below the waterline and I have noticed that on boats that have been out there for a while, they do get condensation in the bilges. While building, we shoot 3 heavy coats of International "intershield 300" high build epoxy in the bilges to seal them up, and we have had no problems to date. I suspect this is the same product as 264. You mentioned fireproof foam....we have always tried to get customers to shoot this in the engine rooms. We still coat the foam with "No Fire" paint. However last year our foam supplier told us that there was essentially no difference between the fire rated foam and the regular foam, and that the fire rated foam had lost it's mil spec rating anyway. So, we are sticking with the no fire paint as a way to inhibit fire spread. Having witnessed the odd welding fire catch the foam, I can tell you that the no fire paint does work. Anyway, I digress...this is an interesting topic for metal boat owners and builders, and I look forward to more discussion on the topic. Sincerely, Brian Smyth Director of Engineering Yachtsmiths International Inc. 902-463-0741 http://www.yachtsmiths.com/