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 corrosions which damage metals. Special penetrating formula displaces trapped grit and frees sticky, rusted or corroded mechanisms. Break Free CLP has superior lubricating qualitities, keeping parts working smooth and easy, utilizing a multi-ingredient secret formula which includs PTFE for improved boundary film strength that reduces friction, retards wear and stops build-up of foreign matter.