SAF-T-EZE PEN-OIL is a hydrocarbon based compound formulated with low surface tension to allow it to penetrate accumulated grease and grit deposits as well as rust and other corrosion. It displaces moisture and clings to metal providing a thin protective film against oxidation. SAF-T-EZE PEN-OIL can be used on steel, aluminum, brass, copper, magnesium, nickel and other commonly used metals and alloys and will not harm rubber, plastics or painted surfaces. To assist in getting into difficult places, SAF-T-EZE PEN-OIL can also spray upsidedown.