If you have a whitewater kayak outfitter nearby, look for a product called Hydrogrip. You use is the same way as contact cement, but it's supposed to be waterproof (or close enough). I've used it, but I can't say I've really tested it in really wet conditions. But I haven't had any problems either.

Ross

> I recently completed my Chesapeake 17 LT and outfitted the cockpit with
> seat, hip pads, and knee braces built up from 1/2" closed cell foam
> and held on with contact cement.

> I was disappointed to find that everything came apart once it got wet (I
> thought I would try a roll and was successful in doing it halfway!).
> Thinking the problem was the old cement that I used, I bought a new can
> and reinstalled everything. Although it seemed to hold better, I still
> lost a knee brace, and maybe would have had further problems with longer
> exposure to water.

> Any suggestions? All the info I've seen suggests using contact cement for
> this purpose. Is there more than one kind? I used Elmer's 'Neoprene-based'
> cement.

> I have heard that the 3M '5200 marine sealant' is excellent stuff that
> never comes off. Maybe I should be using that?

> Thanks for any help - Dave