Barricade rust protection dauber pen rapidly drives out moisture from metal pores and deposits a transparent protective coating, which seals surfaces. 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 dauber pen is also an excellent penetrant for loosening rusty or frozen parts. Take along this new easy to store small pen by keeping one in your range bag or firearms cleaning kit at home. Features: - long-lasting rust protection - no mess application.