Why do you want to create an insulating layer with paint that will cause your brakes to overheat? The thermal energy the brakes absorb by friction must be dissipated by air blowing over the drums. Painting the drums makes that difficult to do.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!