I'm trying to install a set of North Water D-Rings with vinyl bases on the underside of my (North Shore)composite kayak's front deck which I'll then string with bungee cord to hold a bilge pump, etc.. I used Weldwood contact cement which I used when padding out the thigh braces with great success. However, the contact cement does not seem to be creating a permanent bond in this case. What bonds vinyl to fiberglass? Is vynabond the answer? How about Lexel, Goop, or some 3-M product?