Black trim restore?

[Matt Suffern]

Anyone have any recommendations as far as a product that will restore the black rub strips around my '86 4kq?  They're beginning to fade noticeably--you 
can see it on the rear bumper in this picture, in spite of the fact that the car's just been rained on:

http://www.unc.edu/~msuffern/audi/audi11.jpg

I've heard of stuff that sprays on, and stuff that rubs on, but no one I've talked to has had personal experience with the products.  Any BTDTs would be very 
helpful.  Thanks!

Matt
'86 4kq
Chapel Hill, NC