I did mine with the krylon fusion as well. I did no prep but a good wash, and no clearcoat over it. It looks great and doesn't chip or wear badly at all. Plus it is so easy to do that it's nothing to repaint them if they start showing signs of wear. Seriously it takes all of a half hour to do all three.

99 Black SVT -3L Hybrid w/.5mm overbore, Spec clutch/flywheel, MSDS, BAT intake, K&N open, 17'Konig Tantrums, DMD, Opt. TB & Y, Powerslots, Bassani w/ magnaflow res. 96 SE MTX- "The War Wagon" "I'm in love with my car..." -Queen