Molding my hoodscoop and side skirts, need help!

Ok, This is just a quick and simple quistion. I wanted to attach my hood scoop and side skirts to my car with tiger hair. then go over that with bondo to make it all look like its one piece... (molding it on is the sense) but I was just wondering if the tiger hair will adhere fiberglass to metal and not crack 6 months from now?