epoxy

Here is the main ingredients to get the fiberglass fenders bonded to the metal body.

Since Im running a fuel cell, the fuel door will not be needed. I applied the fiberglass mat to the inside...
Then used a thickened resin to fill in the outside.
I applied thickened epoxyresin to all contact surfaces before riveting. The rivets have been countersunk into the fender. This will allow me to fill in the holes from the rivets to be flush with the fender.