Here's some stuff I found while searching for different products I could use on my yak.
It's a structural adhesive, not a glue. Its made for poly, the stuff yaks are made of.
I have never used it so I can't tell you how well it will work but it does appear to be a viable solution to your problem.
Just make sure if you use it that you follow the directions!
Good luck.
http://www.tapplastics.com/shop/product.php?pid=435&