Can I use Mastercoat Permanent Rust Sealer on clean body panels or galvanized metal?

Yes. Over the years, both we and our customers have cars completely primed with Mastercoat Permanent Rust Sealer inside and out, especially in Florida where it is very humid. When painting over clean steel or galvanized steel, we recommend Mastercoat Metal Prep & Rust Remover to adequately etch the steel. This does a number of things: it changes the surface texture of the steel for better adhesion, kills the microscopic rust, and prevents future rusting. Mastercoat Metal Prep & Rust Remover is excellent for cleaning rust off parts and putting them away rather than coating them with a cheap primer.