Ive added scoops of plastic and fiberglass to steel hoods and fiberglass to fiberglass and find the best way to do it is a few small rivets then fiberglass resin and cloth, several layers starting small and widening with each new layer. Then some sanding followed by some fiberglass filler to get it all smooth and lots of tedious hand sanding. May be the hardest way but it will last forever. I lift my hood on and off the car now using the scoop as my handel . I installed it using this method.