I have put rifles away for years at a time with this protecting the bore of my bpc rifles with no rust or problems what so ever. Break Free CLP has a special cleaning action that breaks loose dirt and corrosion mechanisms. Break Free CLP has superior lubricating qualities, keeping parts working smooth and easy, utitlizing a multi-ingredient secret formula which includes PTFE for improved boundary film strength that reduces friction, retards wear and stops build-up of foreign matter. 4 oz. squeeze bottle.