Rust-Oleum Stops Rust Rusty Metal Primer helps stops rusty metal surfaces from peeling, chipping and cracking. Superior durable and corrosion resistant bonds tightly to rust to transform it into a sound topcoat base. Stops Rust formula provides maximum corrosion resistanceIdeal for interior / exterior use on heavy rusted metal surfacesOil based formula, Protects against the harsh elements of the weatherDries to the touch in 15 minutes, can be recoated within 1 hour or after 24 hours.