We had our rotors turned at the local NAPA. After we got the rotor home, we used Ph-ospho-ric (available at most automotive paint stores) and a scuff pad to clean the rust off the rotor. Afterward, we used brake cleaner and lacquer thinner to remove any residue from the rotor. We then applied POR-15s manifold paint from Classic Restorations and heat-cured it with a propane torch. If you do this, be sure to keep the flame moving. The best course is to have the rotors heat-cured.