My 81 240D has damage on the front passenger's side fender. I think that I will be able to pop out the dent if I get it off but I think it is glued or epoxied or something. I am sure that I have all the bolts off but I can't get the thing off. I'm pretty sure that the undercoating is what is keeping it on. Can I cut it off with utility knife from below or is there another way? I have to do this on another car soon as well. Any helpful techniques?