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I have a very nice large metal spoon that I think used to have some kind of coating on it. The coating has degraded and the spoon, which must be just plain steel, has a tendency to rust. I can easily power-brush the rust off, and clean it up nicely, but I'd like it to stay clean. Yes, I know a thin coat of food-grade mineral oil will help preserve it, but it'll need to be applied regularly. My question is whether there is some durable paint/sealer that I can apply to this spoon, that leaves an impenetrable hard layer, without worry about polluting my food. I know there are some excellent sealers that fishermen use for their steel equipment (knives, hooks, etc.), but I'm not sure I want to be stirring my soup with that. Ideas?