Nox-Rust 3100 rust preventive liquid is an effective transit coating that can protect metals stored outside for 5+ years. In salt fog testing, the most rigorous ASTM standard for measuring the effectiveness of corrosion protection, Nox-Rust 3100 outlasted the competition in salt fog and humidity testing. Results prove Nox-Rust 3100 is the best choice for protecting equipment and machinery during export and in severe environments. Will not harm painted surfaces or rubber hoses. Also sold in 11 oz. aerosol cans.