What is an approved treatment to prevent rusting on metal tools?

Using a light film of oil is an effective method for preventing rust on metal tools due to the oil's ability to create a barrier between the metal surface and moisture in the environment. Rust is the result of oxidation that occurs when iron or steel is exposed to oxygen and moisture. By applying oil, you effectively reduce the exposure of the metal surface to these elements, thereby inhibiting the chemical reaction that leads to rust formation.

Oil can penetrate into tiny crevices and provides continuous protection as it has water-repelling properties. This treatment is particularly reliable for tools that may not be used frequently, as it ensures that even when stored, the tools remain protected against potential moisture that could lead to rusting over time. Regular maintenance using oil will extend the lifespan of metal tools, keeping them functional and reducing the need for replacement.

Other methods, such as painting or varnishing, can also provide protection but may not be as effective at penetrating surface imperfections. Keeping tools dry helps to prevent rust, but without an additional protective layer, dryness alone might not be sufficient to shield them from humidity or accidental exposure to water.