Originally Posted By: bretfraz
After some research on Jeep forums, I came across a product called Penetrol. It is an additive for house paint but is also used to condition faded fiberglass. I applied it to the GC and it made a noticeable improvement. The owner was happy and it seemed to last a few months according to him.
Painting the flares is probably the best long term solution but if you want to try something before that, apply some Penetrol to them. You can find Penetrol at Home Depot and other hardware stores.
The Penetrol sounds interesting, I've never thought to use it on fiber glass. I've found that NuVinyl works alot better than typical protectant on exterior trim, and it would certainly be harmless if it didn't work.