Birchwood Barricade Rust Protection for firearms rapidly drives out moisture from firearm metal pores and deposits a transparent protective coating which seals the surface. It's the best way to protect your firearms from rust. Rust Protection withstands 500 hours in ASTM humidity test and 96 hours in ASTM salt spray test. Barricade Rust Protection for firearms is also an excellent penetrant for loosening rusty or frozen parts, as well as a good lubricant and an effective bore cleaner. Don't let rust destroy you expensive firearm. It's never been easier. 4 1/2 fl oz Spout Can.