So i bought my truck in 2006. it came with a set of new bushwacker fender flares that the po bought to replace the ones already on it but he never installed them. I installed them and drove it with those on since then. After a couple years they got ugly and faded. I tried that "back to black" stuff. But they went "back to faded" pretty quickly. So i was about to get some rubbing compound and go at them when my coworker suggested i use a heat gun to bring back the black. I was skeptical of course. But i figured why not give it a shot. I already have a heat gun so what do i have to lose? Well looks like i owe him a beer because the results are pretty impressive. it took about 10 minutes to do both. Probably less time than writing this will take.
i was worried about deforming them but it wasnt an issue at all