Cast iron can be susceptible to rust if it isn’t regularly treated with a protective layer of carbonized oil. This layer of oil is called seasoning and is what preserves the cast iron from moisture damage. Seasoning cast iron pots is simple, but protecting your cast iron pot rack is more challenging.
To prevent your cast iron pot rack from rusting, hang it in an area that is not exposed to moisture. A dry environment limits oxidation and rust formation.
You can also buy rust-inhibiting spray, which you can apply to your cast iron pot rack annually. If your pot rack becomes chipped or dented, repair the damage and apply a sealant as soon as possible. These weakened areas provide an exposed surface for the rust to develop.