Theoretically, as long as it's a truly waterproof structural glue you should be fine. As a practical matter, though, you're going to have to make sure that you can clamp it up without any gaps and maintain the required clamping pressure. Any voids in the final product will act as stress concentrators and encourage fatigue failure. That's where epoxy has the advantage, with its ability to fill gaps.

But if you have the skills (and clamps) to do fine joinery quality work along the entire length of the curved surfaces it should be fine. Otherwise use the epoxy.

It should, however, still be encapsulated in epoxy for water and abrasion protection.

Good luck,

Laszlo

   I think potentially one of the advantages is that it is better at gap filling than epoxy. I've heard of other people using it in a marine environment , but not seen anyone use it for this. It will get coated with epoxy once it is completed and cut to size. I've got lots of clamps, so I might give it a try. Thanks for the response. Robert