Rust Scat® Polyurethane Enamels are a rust-preventive coatings for metal substrates. They are easy to apply, with excellent adhesion and wetting properties. The enamels cure to a durable and attractive finish. Formulated with a urethane-modified alkyd resin, it can be applied to interior or exterior ferrous or non-ferrous metals. (Not intended for use over galvanized metal.)