DuPont Teflon Penetrant Penetrates quickly to free severely frozen or rusted bolts and parts contains Teflon fluoropolymer for lubrication of freed part Provides long-term rust protection using advanced corrosion inhibitors Surpasses 1000 hours in ASTM humidity cabinet rust test For use on stuck bolts, nuts, pipe threads, valves and other rusted metal parts Low odor non-staining does not contain silicone