Barricade Rust Protection rapidly drives out moisture from metal pores and deposits a transparent protective coating which seals the surface. It?s the best way to protect your firearms from rust. Withstands 500 hours in ASTM humidity test and 96 hours in ASTM salt spray test. Barricade Rust Protection is also an excellent penetrant for loosening rusty or frozen parts, as well as a good lubricant and an effective bore cleaner. It?s never been easier. Individual 5" x 8" cloths are impregnated with Barricade Rust Protection and sealed in a foil packet for compact carrying. Also handy to use as a bore cleaner / protector when run through gun bore. Easy to use ? tear open packet, unfold cloth and wipe metal surfaces!