Since I am a belt and suspenders kind of guy, I attached the fiberglass with both rivets and scotch weld. By the way,..That Scotch Weld is pricey stuff...but no ranting here... The final step will be to smooth and fill over everything using the lightweight blue filler. (I think it is called Super Fil)
As a final note, I have no idea why this rudder took me so long. I will need to get more efficient with my time.......Yeah, probably not going to happen..........