I purchased this for use on a 40 year old 1976 Honda MR250 with White fenders that had yellowing, checking, and even some mold on them! Took some elbow grease and time but the result was almost new looking fenders!.
I used this on my 4 wheeler plastics. The instructions said that for faded plastics it wouldn't work as well. So I used anyways and sanded it first it worked ok. Then I switched to a steel wool pad with soap and scribed it clean then used the renew. My plastics now look like new. I would refer this product to any one who has old plastics or scratched ones. This stuff is great.