It says it is a paint additive, but if you read the description on the back, it is also for restoring faded fiberglass. I applied it last spring, and it is still going strong after a little less than a year. My rear bumper plastic and the side steps were white as a sheet. They look totally normal now after I put this stuff on.
Anytime I have tried painting my plastics, the stuff just chips or wears off after a short time.