Forever Black, does work. A little quick observation tells me the "kit" is pretty much nothing but Windex to clean the plastic first and black spirit dye in a bottle with a sponge on top. I've done an experiment myself with Windex and spirit dye I use for dying leather - almost identical results. This is consistent with other products I've used for painting/dying plastic that recommend using an "ammonia based cleaner" on the part first.
The problem with both methods (less so with the Forvever Black) is streakiness. On smooth rubber like bumpers, you've got to SOAK it in the dye, and even then you've got to be careful to avoid streaks.
On matte or textured trim it works terrific. I just wonder if it's worth $15 for 4 oz. of the stuff, when a quart of spirit dye costs about $10. Granted, the Forever Black seems to have additives to go on a bit smoother, but still...
On bumpers, I'm more inclined (and will try this one day) to attack the rubber with some 600 grit sand paper and steel wool. Bumper rubber should just be oxidised on the surface, removing a bit of the surface oxidation should leave it looking brand new.
Let us know what you end up doing - take before and after pics!
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Sean - now frolicking in the Land of a Thousand 240's (aka, Fredericksburg) thrice a week.
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