Stop rust in its tracks with Our Rust Encapsulator. This paint-over-rust formula is the easiest way to stop rust and corrosion from forming and prevent existing rust from spreading. It seals metal parts and penetrates beneath the surface to encase rust while leaving behind a paintable surface. Rust Encapsulator can be used as a primer for a variety of topcoats or left as-is if you prefer a low-gloss finish. Ideal for chassis and undercarriage rust prevention. With high heat resistance, you can even apply it to the engine bay.