PB Blaster is the #1-selling penetrant since 1957. The same legacy formula that quickly loosens rusted or frozen parts. PB Blaster penetrant also contains a non-evaporating lubricant that protects against further rust and corrosion. It is also a great rust inhibitor and penetrating oil for seized bolts, rusted nuts, corroded pipe threads and other industrial, plumbing and agricultural equipment applications. Simply saturate the troubled area and if you need more, do it again.