WD-40 300004 Specialist Rust Release Penetrant Spray, 11 OzWD 40 specialist rust release penetrant penetrates deep into crevices, threads and seams to break the bonds that hold stuck parts together. It also leaves behind a protective layer and helps prevent rust and corrosion from re forming. Containing blu torch technology, a proprietary blend of synthetic additives, our rust remover spray quickly goes to work on rusted nuts, bolts, threads, locks and chains. WD 40 specialist rust release penetrant spray