The Rust-Oleum Stops Rust 1 qt. Gray Hammered Rust Preventive Paint features an oil-based formula that dries to a hammered finish for a unique look. The paint helps prevent rust and can be used both indoors and outdoors for versatility. The paint can be used to hide flaws and imperfections in scratched and rusted metal and can be applied directly over rust for your convenience. Dries to the touch in as little as 4 hours. Coverage is up to 100 sq. ft. depending on surface porosity.