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i have not tried paint. We use Brilliance marking fluid. It's for laser engraving. I hear folks also use Cerramark, but it's more expensive... (none of it's cheap)

I use a C02 laser and marking fluid. While it does not engrave down into the steel, the marking fluid penetrates the steel into the pores. I can tell you by experience that you will have to grind out the mark if you mess it up.....