Work it like a pro. Since 1957. Revolutionary valve sprays upside-down. Rusted nuts, bolts, pipe, threads, etc. The original nut & bolt buster. Breaks loose faster. Powerful rust. No.1 selling penetrant. Breaks free rusted or frozen parts. Protects against further rust & corrosion. Attacks rust from all angles using our unique capillary action. Paint Shop Safe: Contains no silicone. B'last On: Nuts & bolts. Corroded pipe threads. Anything that is rusted or corroded, stuck or frozen. Use in automotive, industrial, marine, agricultural & other operations. Bonus: PB does not evaporate, it leaves a lubricating film on parts to prevent rust & corrosion.