Synthetically coated cookware from the store (such as a Teflon pan) is convenient at first, but such cookware does have a flaw. When that nonstick surface is chipped or damaged, there’s nothing to do but purchase a new pan. This is not the case, however, with cast iron pans.
A permanent nonstick surface can be formed on cast iron cookware, but it must be “seasoned” in order to achieve that effect. The act of seasoning also prevents rust from forming on the cookware.
To season:
-Coat the pan in a non-liquid grease/oil.
-Bake for 15 minutes in a 250 to 300 degree F oven.
-Remove from oven and remove excess grease. Bake for an additional two hours.
This is why some people believe washing cast iron pots diminishes the quality of the pot and the taste of the food. The coating is actually a protective layer to stem harmful rust, and it also adds flavoring to the food.

