Protects, Displaces Moisture. Lubricates. Over 2,000 Uses. Developed originally as a formula to help displace moisture from space shuttle components, over the years WD-40 Multi-Use Product has become a trusted friend to solve a whole range of problems in your home, workshop, factory and garage. The formula may be the same, but our customers keep discovering new ways to use it. It's great as a rust removal product for tools and other metal surfaces, and as a lubricant for machines, car parts and other mechanisms.