If you have a Lodge Rust Eraser, use it at this juncture to easily remove surface rust on cast iron cookware. It's made of rubber and silicon carbide—essentially sandpaper without the paper—bound together into a solid brick for easy handling. After you use the rust eraser, thoroughly remove all residual material, and continue with the restoration process detailed below.
Oil (Step 2)
Apply a very thin, even layer of cooking oil to the cookware (inside and out). If you use too much oil, your cookware may become sticky.
Bake (Step 3)
Place the cookware in the oven upside down on the top rack and place aluminum foil on the bottom rack to catch any excess oil that may drip off the cookware. Bake at 450-500 degrees F for one hour. Allow to cool and repeat as necessary to achieve the classic black patina.