This web site
http://www.ecfibreglasssupplies.co.u...2039tc.aspxhas a good description along with the safety and technical data for gravicol paste but this product
http://www.ecfibreglasssupplies.co.u...-6470-w-2.aspx mentions its good for bonding both fibreglass and metal.
I'll email the company to see which bonding paste they recommend for bonding fibreglass to metal.