Titebond III, how good is it?
 

"Paul Mosley" wrote in message
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How waterproof is it?

Just to test the technique, I made a raft out of tongue and groved PT
lumber, glued together with TBII. I anchored it in a lake. 8 months later
it was good as new.

Never used TBIII, but if it is as good as TBII, you will be fine.