'Titebond 3' (note 3) (green Label)
Stated to be totally waterproof except for items permanently under the waterline I have used it on the Huntsman build throughout.
What has impressed me about it is it's incredibly quick grab time.
Agreed, as yet to be tried on the water but if it lives up to its stated properties and there is no reason to suspect otherwise this is one excellent woodworking glue
Hope that helps - Ramon