OK this is driving me a little nuts! The whole issue is {what will bond aluminum to fiberglass}! The 3m website does not say 5200 will bond aluminum except (maybe) and not as well as wood or other materials, and only if I prime the "metal". It does not say what kind of metal or what to prime it with. Also I can not find out if epoxy
and or what kind of epoxy will be strong enough to create a good bond that is why I was looking at fiber glassing a base and using mechanical "bolts" and also 5200 on top of it all for some give due to vibration ext. then bolting it down. I just want the grab rail to become part of the boat and not come off. I am thinking I will first try something and bear with me. Drilling several holes in the base plate so the 5200 can ooze through. Then using like 8 screws to the deck for a mechanical bond. I am about to just get some 8' bolts and go through the whole dang hull! LOL