Why does cast iron rust? ... Without the protective layer of carbonized oil called seasoning, cast iron is susceptible to rust. Even a well-seasoned pan can rust if it's left in the sink to soak, put in the dishwasher, allowed to air dry, or stored in a moisture-prone environment.

Is it normal for cast iron to rust?

Cast-iron skillets are naturally prone to rust. But even if it has turned bright orange, the pot absolutely can be fixed.

How quickly will cast iron rust?

A minimum of 1 hour is typically needed for an average rusty pan, and you should see the rust starting to fall away from the iron surface after this.