This gun oil also serves as a rust preventative, with over 40 years of proven performance in all climates, effectively preventing rust in the most challenging hunting and shooting conditions. It is not a modern synthetic chemical that damages gun finishes and bluing; rather, it is a blend of petroleum distillates specifically formulated for use on firearms, tools and machinery. The oil penetrates pores to remove fingerprints and moisture, leaving an invisible film that protects and lubricates. Unlike general-purpose water-displacing rust preventatives, RP2 does not gum up in crevices and hard-to-reach areas.