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On my original rusting rotor top hats (I've just recently installed new ones), I kept the rotors on the car & used a strip of emery cloth looped over the hat section, while turning the hub - & saving my knuckles. That removed 90% of the rust, I then finished the job with wet & dry before painting with heat proof engine enamel - no primer required.
Of course, if you want to do a proper job, you need to remove the rotors completely because the rust on the inside is 10 times as bad as what you can see - its that hidden rust that drops and stains the inside of the wheels every time you wash the car....
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