I'm so glad to have my old 91 740 working again, I'm actually starting
to clean it up and make it look spiffier.

The bumpers were a light oxidized gray.  Fella at the auto parts store
recommended this "Back2Black" product, which is a white creamy liquid
which I've applied, and applied, and applied to the bumper.  Seems to
need to soak it up, or layer up, or something.  Anyway, its now a medium
dark gray.

I bought some "Tire Black" for my tires.  Clear liquid.  One
application, my tires look shiny, etc.  I tried it on one section of the
bumper, and with one spray, that area is shiny and black.

Question is, which product is going to last.  If I have to keep
reapplying the "Tire Black" every few weeks, as it says to do for the
tires, that ain't gonna work.

Any experience with this?