Keep tools sharp by hand with a simple, standard mill bastard file (that is a flat file, medium coarse, single cut)
Use the tool often and clean it off after use to limit development of rust. Wipe it down and let it dry, if used in wet conditions. If putting the tool away in a moist or non-climate controlled environment for a while, you can apply a light coat of mineral oil, motor oil, or other oil. Or use paste wax, or buy a spray can of Rustoleum 2X clear coating enamel. In all cases, after cleaning off the metal with a brush or rag to remove dirt and build up of other materials, wipe or spray on the new coating following directions of the manufacturer. All these options essentially create a thin barrier between the metal and the moisture that will eventually lead to rusting. If rust appears on your tool, clean it off with a wire brush, Scotchbrite pad, or steel wool and then apply a coating.
Oil wooden handles periodically for longest life - boiled linseed or tongue oils work, even danish or teak oil will be fine. You can also opt for paste wax as a coating. You are trying to create a surface barrier to fill grain and minimize the expansion and contraction of the wood that will happen as moisture levels vary.
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