We applied Mothers Back-to-Black to our wheel flares, vinyl bra on the front of our car, and some Bestop soft coverings for our Jeep. The results were mixed, but positive. Soft pliable vinyl really responds well and comes pretty darn close to that out-of-the-box color. The harder plastics of our extremely sun beaten flares did return to black, but the years of neglect and sun damage were a bit too much.
Bottom line? Just like using sunscreen, prevention goes a long way. We recommend you pick up some Mothers Back-to-Black, and just like sunscreen, apply liberally and often. Legal disclaimer: Please don?t confuse sunscreen and Mothers, or babies (Jeeps) and babies (the human kind).