Epoxy / Liquid Nails

, Never will come off, but who ever takes their bumper off unless your gonna put a body kit on? But if you are feeling Billy Mays about it, get some green on white technology hehehehe (Mighty putty)

. Really just putty it up right by the crease in the wheel base if it is that lose, just make sure it seals with like pressure so its not pushing it out to catch wind and make drag. (Just an educated guess, I am not a professional, and applying any of the stuff mentioned can cause problems possible, not responsible) GL!