Treated floors with por 15. Underside is undercoated. Rust is not a issue in this area since they don't salt the roads and there no ocean's near here. The only real rust was under the back window right below the stainless trim and it was removed. The only time it will get wet is when it is washed. Other than that it is tucked in the shop. I love this site as it is a great place to find info and parts. Thanks