I use an absolutely fantastic product for bonding fiberglass to fiberglass, but it's made for bonding all materials to fiberglass, like metal and wood, and other composites.
It's from Fibre Glast. It's called High Strength Epoxy Adhesive 1101. Only thing is that it's two part, but very easy to match up one-to-one by weight or volume. Good working time. Not cheap though. But as they say, you get what you pay for.http://www.fibreglast.com/product/Epoxy ... oxy_Resins