Rust Preventive Oil is a type of lubricant designed to protect metal surfaces from corrosion caused by moisture or exposure to the elements. It is commonly used on tools, machinery, and other metal objects that are stored for extended periods of time. The oil forms a barrier between the metal and its environment, preventing the air and moisture from reaching the metal and causing rust to form. Rust Preventive Oil can be applied in a variety of forms, including sprays, coatings, and dips, and can be used on both ferrous and non-ferrous metals.