Birchwood Casey Barricade Rust Protection is a great firearms maintenance tool that 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 for firearms is also an excellent penetrant for loosening rusty or frozen parts, as well as a good lubricant. Comes in bottle of 4.5 liquid ounces.