How can I effectively cure a cast iron skillet?

To effectively cure a cast iron skillet, clean it thoroughly with hot water and a stiff brush, then dry it completely. Apply a thin layer of vegetable oil or shortening to the skillet, inside and out. Place it upside down in an oven at 350F for an hour. Let it cool in the oven before using. Repeat this process a few times to build up a good seasoning on the skillet.