Been lurking here, we have 2 jeeps, your site is a wellspring of good info, thanks.
I'll toss my 2 cents in here.
Normally on my junker daily drivers (not jeeps) they have lots of faded black trim/bumpers ect.
I've tried everything, most of them are short term useless.
With the last batch of test patches rubbed on the one cars black bumper, (baby oil, crisco, synthetic motor oil and antifreeze) I'm seeing the SYNTHETIC motor oil is staying dark and shiny after a week. The crisco got sticky.... bad idea. Oddly, the antifreeze is also staying black and shiny too. Baby oil did not darken the black enough to begin with.
Yeah... I'm cheap and curious.
I used regular new motor oil last yr on aall the trim on an whole other car, and it seemed to not only fade but remain kinda oily.
the synthetic oil I'm testing this week not only buffed off dry but is holding the shine very well.
I'm not crazy about the idea of the antifreeze even if it does work, the cats licked off the crisco and if they do that to the antifreeze, I'll have more problems than just faded bumpers.
So far this season, full synthetic motor oil is the winner for a total wet down-wipe off & buff job.
I'm going to do a trial run on a festiva's rear bumper (black vynal/rubber something) tomorrow with a heavy smear on, leave soak a while and buff off, and if it lasts more than a few weeks......
The jeeps get their faded black stuff oiled.
I'll keep you informed on the progress.
It seems like the plastic vynal whatever it is these flares and bumpers are made of absorbs the synthetic motor oil and darkens it faster than regular motor oil, which I kinda had to rub in harder and, once its wiped off, it seems to be dry to the touch and not oily/greasy like reg motor oil.
I might be onto something.