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 up to 2x faster than the competitionPrevents rust 10x longer than the competitionPenetrates rust to free up stuck, frozen or seized equipment and partsSafe to use on metal, rubber and plastic parts50-state VOC compliant