WD-40® Specialist Rust Release Penetrant Spray leaves behind a protective layer that helps prevent rust and corrosion from re-forming. Containing Blu Torch? Technology, a proprietary blend of synthetic additives, WD-40 quickly goes to work on rusted nuts, bolts, threads, locks and chains. WD-40 Specialist Rust Release Penetrant Spray frees rusted parts 50% faster than the leading competitor. It is 50-state VOC compliant and safe to use on plastics, rubber and metal.