we got a 78ish vette with a clear rubber bumper with the usual warpage near where it mounts. my idea is to use panel adhesive on the backside to stiffen it up, then some rubber bumper repair for severe lows, then a flexible filler on top. I'm hesitant to try to get the shape back with heat as it might want to sag back down again. i'm thinking it might be better to let it be and fill knowing it's settled. not sure if the bumper uses the vette style wavy washers as i didn't take it off. does it need those washers?
please don't respond if you've only read how this is fixed, cause I'm not fixing this in theory.