94SVXRED,
I would suggest that if you were able to get the rust off with a rust remover (leaving the rotors on the car), that in no time at all, they would again be rusty - if they were not properly prepared and painted. Properly prepared and painted obviously requires the rotors to be "OFF" the car.
Also, some shops (auto parts / machine shops and the like) can "dip" the rotors for you ( I believe the same dip for cleaning engine blocks and other parts) to remove grease and rust and everything else in prep for painting. You just have to handle them with gloves (clean ones) until painted. And the painting has to be done fairly soon, otherwise, the rust begins again.
Harry
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