posted 4 years ago
I suppose it depends on your goal to some extent. I can't imagine damp sand preserving steel. That would encourage corrosion. Maybe the sand shines the surface if the tool is used frequently, giving the appearance of preventing rust? If your goal is a shiny tool, good idea. Oiling tools do prevent rust. working oils into the metal excludes moisture and greatly reduces oxidation (rust). Pretty much any oil will do as long as it's not acidic. Before modern rust resisting metals and coatings, people used to 'brown' metals to resist corrosion by intentionally causing or allowing the surface to rust, scrubbing the rust with something like steel wool, then rubbing with oil. Repeat a few times and you create a nice layer of oxidized material that resists any further corrosion of the metal underneath, similar to the way galvanizing protects the metal underneath. It generally looks brown, so the technique is called browning, and is still used by metalsmiths today. For something like a shovel, blade, or a fork, you're going to constantly wear the surface coating off, so you have to oil occasionally, especially before long term disuse like (maybe) winter.