Wash new cast iron cookware with warm soapy water and promptly towel dry. Generously coat cookware with vegetable shortening. Bake in oven for 1 hour.
Remove skillet from oven and rub again to redistribute oil. Place in the oven and bake again for 1 hour. Remove from oven. Wipe excess oil off with paper towels, then allow to cool before storing. Store in a cool, dry place, with paper towels below and on top of skillet to protect shelves and skillet.