WD-40: A fast-acting penetrant with capillary action to penetrate deep into crevices, threads and seams to break the rust bonds that hold stuck parts together. WD-40 Specialist® Penetrant is a fast-acting penetrant with capillary action to penetrate deep into crevices, threads and seams to break the rust bonds that hold stuck parts together. It is a low odor formula that works on contact to free rusted nuts, bolts, threads, locks, and chains leaving behind a protective layer that prevents rust and corrosion from re-forming. It can also Spray 2 Ways®- up for stream and down for a wider spray.Penetrates rust to free up stuck, frozen, or seized equipment and partsSafe to use on metal, rubber and plastic partsIdeal for use on nuts, bolts, threads and locks360° valve, use can upright or upside downStraw down for a wide sprayStraw engaged for a precision sprayGreat on seized pedal axles, Bottom brackets or corroded hanger bolts etcFaster acting, low surface tension formula penetrates problem areas fast400ml