On these drums I didnt use RPM (but could have). I seasoned them in my oven like a frying pan. I washed the Evaporust off with Acetone (NOT WATER!) and a 0000 steel wool pad then coated them in heavy bacon grease and popped them in the oven at 250 for 3 hours cooling them slowly for 3 more hours. After I cleaned the pad contact areas with brake cleaner and installed. A month or so of daily driving in mixed weather, zero rust so far