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It may be wax residue. Try a detail brush on it and see if that takes it out. Mine can sometimes look a little white too, washing them and then putting armor-all on them might help.
Krylon Spray paint for plastics does a great job restoring them to black. I did the fender flares on my old FX4 with that stuff and it came out very nice.
What a timely thread. Yesterday I applied the Bondo - Restore Black to my bedrails, cowl and running boards. I am very impressed with the results. I was not going to make any comments or reccommendations until after a few washes. It does look very good at this time.
Yep, As stated, got it at Advance auto. Damn - those guys get a lot of my money. It cost alot to maintain a "fleet" of( 4) vehicles, all of which have over 100k miles.
Wifes caddy (STS) 104k
Sons Toyota Supra Turbo 154k
Ranch Rat Isuzo Rodeo 4x4 215K
Mine 160K
Daughters ? (15-1/2 years old) Probably a '65-'68 mustang.
On the bedrails, I just shoved masking paper under them - using a plasitic bondo spreader to lift the cap away from the fender. It was quick and easy. I used a paint brush to apply the gel (It dries evenly, no brush marks). The product cleans up with water - just keep a damp rag around to wipe up any mess. Use disposable mechnics gloves as well - if you get it on your hands, you'll need to grind it off. Even though it is a water based product, it bonds well.
Update on the "Bondo Restore Black." Well it has been almost a month now, - 4 washes - and I have driven through some pretty horrific thunderstorms. I have been in western Nebraska for about 10 days (Lots of sun and 2 hail storms). Everything looks just as good as it did when I first applied it.