WD-40 Specialist&nbsp;Rust Release Penetrant Spray with Blu Torch&nbsp;and SMART STRAW&nbsp;SPRAYS 2 WAYS, 11 OZ Penetrates deep into crevices, threads and seams to break the bonds that hold stuck parts together. Its fast acting and ideal for nuts, bolts, threads, locks, and rusted chains The WD-40 Specialist line is designed with industrial strength quality and extreme penetration for your hard to solve issues Safe on plastic, rubber and metal; leaves behind a protective layer and helps prevent rust and corrosion from re-forming Blu Torch Technology penetrates rust 2x faster. Blu Torch is proprietary to WD-40 Specialist Rust Release Penetrant WD-40 Company has been around for 65 years and has never stopped their innovative mindset. The WD-40 Specialist product line has been refined to perfection so you get the results you need with ease