Let me know the exact brand of adhesive you use to flange the bumper back together. I've tried the black 3m adhesive and also sikabond which seemed to be permanent on test pieces but for some reason it keeps falling off the bumper I think the sun might be doing it I'm not sure. Trying to avoid getting that stuff jets recommended because it's kind of expensive. Metal flanges on fiberglass by the way. I ground cleaned and bonded all flanges two times I have 6 sets on the rear bumper :\