do do them properly it is best to take them off the car proper wire brush down and a good clean with some acid free alloy wheel cleaner then use hammerite either brush on or spray
people say use heat proof paint but they seem fine without
My stilo has been painted with hamerite and has been fine iirc I does say it can be used to paint bbqs so can take the brakes heat. I also know loads of others who have painted there's using this to