If you store your metal tools in a high-humidity environment, you’re asking for rust. Unlike older solutions such as an outer layer of wax, oil, or WD-40, Boshield T-9 Rust and Corrosion Protection actually penetrates into metals and provides them with a protective coating.
Boeing originally developed Boeshield T-9 for the airline industry, but it’ll work just as well on hand tools, standalone tool tops, or any metal surface. It’ll also help remove existing rust.
Pricing starts at about $8 for the smaller sizes. You can also get it in aerosol cans and in sizes up to one gallon.