adding oil and letting it cool doesn't let all of the fat turn caustic and polymerize though. also just because you cant see rust doesn't mean it isnt on the pan and letting it cool doesn't convert all the rust to magnetite or hematite i forgetti, you should bake it a 450-500f for a whole hour to make sure all unnecessary carbon buildup flakes off and you get a long lasting patina that you can build on lazy maxxing is fine especially if bad ventilation/smoke alarms but i can take soap and a green scrubby to mine and its still shiny
Canada