Loosens rusted and frozen metal parts ? Guaranteed! Penetroil frees stuck fan blades, blower shafts, pulleys, rusted nuts and bolts ? any frozen, rusted, or seized metal part! New low surface tension penetrant creeps into the smallest spaces and breaks and dissolves the bonds of rust and corrosion. Saves time and labor. Lubricates and protects metals. Dielectric strength 50,000 volts. For Industrial and Professional Use Only. Penetroil is specially formulated with new low surface tension technology to creep into the smallest cracks, crevices, seams, or threads of rusted, seized, and corroded parts to quickly dissolve the bonds of rust, corrosion, carbon deposits, gums, varnishes, and grease to free the metal parts. Penetroil displaces water and leaves a lubricating film to protect metal parts and prevent rust and corrosion. Super penetrating formula creeps into spaces as small as one millionth of an inch!