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There is also a commercial product used in boat building for compound curves. It's a foam sheet with a fibreglass backing on one side. The foam has been sliced into 1/2" cubes so it's flexible. Glass the other side and you have a very rigid sandwich in no time. Can be used with polyester resin or epoxy. No idea on price.
There are also many new waterproof glues in the same family as Elmers glue which would probably work. Check out woodworking stores or hardware stores.
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