WD-40 Specialist Penetrant penetrates hard-to-reach crevices, threads and seams to free stuck, frozen or seized equipment and parts. The low-odor, fast-acting formula penetrates up to 2x faster than the competition* with capillary action that removes rust and corrosion on threads, locks, chains, nuts and bolts, while leaving behind a protective layer that prevents rust from re-forming. This industrial-strength penetrant works on contact and comes with a permanently attached smart straw that sprays two ways for broad coverage or a more precise application. Whether you're working with metal, rubber or plastic, this heavy-duty penetrant can tackle all of your tough jobs with ease. *Test Lab: Fred Cuneo (3rd Party); Nail Climb Test; Test date: 03/2021. About WD-40 Brand Whether you need the original blue and yellow can with thousands of uses, or a WD-40 Specialist penetrating oil, lubricant, cleaner or solution to protect against or remove rust, we've got you covered. Repair don't replace with a range of products. Get the job done right with WD-40 Multi-Use Product, WD-40 Specialist, and WD-40 BIKE.