I have a Mustang GT hood scoop that I want to mold into my Explorer's hood. The hood scoop is plastic and attach's the the hood with supplied bolts. Once its bolted down I want to fill the seam and smooth the scoop into the hood. I was thinking of using 3 layers of fiberglass and then finishing with some bondo. My only concern is if it will eventually crack around the seam? What everybody's opinion on this? Thanks for any input.