Frees corroded nuts and bolts, penetrates rust. 50-state VOC compliant. With Blu Torch technology, a blend of solvents,metal working fluids, and surfactants that provide fast-acting penetration. The capillary action penetrates into tight crevices, threads and seams to break the bonds that hold stuck parts together. Helps prevent rust and corrosion from re-forming and leaves behind a lubricating layer. Safe to use on plastics, rubber, and metal.