How to cast iron part 1 how to make green sand Henan 5 Common Problems with Cast Iron Pans and How to Fix Them Complete uncertainty about how to season cast iron We promise seasoning a cast iron pan is way simpler than you think Simply coat the entire surface of your pan with a thin layer of vegetable oil and place it upside down in a 350 degree oven for an hour make sure to put a sheet of foil on the rack below to catch any drips