Etching Steel, Failure

I enameled several steel slabs for etching in vinegar. When I went to scribe them, the enamel chipped off in large chips. The slab that I did not degrease the chips came off as sheets, but even where the slabs were treated to perfection, the enamel flakes off too large. I need to find a better enamel for the job. One that will allow me to scribe a fine line and not chip out large. Any suggestions out there?

Bob

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