On my Barracuda I shot the control arms and the rear axle housing with gloss black Rustoleum. That was in '99 or '00. They still look good. Granted it's a nice weather car but it's been caught in several thunderstorms over the years on some disgusting roads.
When I swapped out the torsion bars about a year and a half ago I painted them with the silver hammertone. They still look good and didn't chip or flake. Later I shot the finned rear brake drums and the hats on the front rotors with the black hammertone. It's more like a dark charcoal than black but turned out nice and has held up well.
I've found the gloss and hammer colors tend to clean up a bit easier than the flats too.
A buddy shot the shocks, springs, and aftermarket suspension arms on his 4x4 '01 Ram with the silver hammertone. It's held up very well and that truck gets run through all sorts of e36m3.
One thing I have noticed is the Rustoleum paints, especially the gloss black, tend to have a whole lot of overspray wen using the rattle cans. More than other spray bombs. Just something to keep in mind when doing the shake and spray.
