With great success I use Formbys Tung oil. Thoroughly clean metal and using a small 1/2" flat artists brush I apply it. No need to put it on thick. It is thin enough to smooth itself out. Work fairly fast because it will soon thicken and leave brush marks if you go over it a second time. Couple days and its ready for some hard use. Others successfully use the traditional lacquer coating. I prefer the Tung oil. I believe Danish oil would work just as well.
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