SHEATH Rust Preventive protects your firearms from rust. It rapidly drives out moisture from metal pores and deposits a transparent coating which seals the surface with a protective film. Withstands 500 hours in ASTM humidity test and 96 hours in ASTM salt spray test. SHEATH Rust Preventive is also an excellent penetrant for loosening rusty or frozen parts, as well as a good lubricant and an effective bore cleaner. Contains FPR to wipe off corrosive fingerprints on all your firearms.