How to keep fillers Black

[Black3]

The used car salesman with the plaid jacket that I bought my car from told me it had shiny black bumper fillers. Even though I specifically asked I was not told that they don't stay black. Even covered in my humidity controlled garage they stay black for 2 days max. I've tried different polishes and waxes (Collinite, Meguiars, Mothers, 3M, etc.) to try to make them last longer before turning gray and dull but nothing lasts. I know this means there days are numbered but will anything help them stay black longer so I don't have to polish the f'n things everytime I want to take the car out?

 

[blackmonte]

Nope, I as well tried everything and they still get dull, I am swaping over to fiberglass this winter to end this problem , oh and mine look new when cleaned they just dont stay that way very long.

 

[Black3]

How about the quickest product? Wipe on wipe off shine, non-abrasive?

 

[conn84gn]

Mine were painted along with the car in 2002 they still shine nice.
I wax the car 1-2 times a years
Wash it many times
I don't see any color change setting in the garage
Basecoat/clearcoat paint