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Filling etched steel, zinc with paint

I have been Etching magnesium for years and recently got into stainless steel. My new customers want the steel filled with black paint or ink in the etched area. I thought this would be a simple task, however I am running into problems. The paint won't stay. Please help.

Thank you,

Eric P. [last name deleted for privacy by Editor]
- Holyoke, Massachusetts

People use cold blacks in etched areas that have a resist on the areas they do not wanted blackened. I have provided such finishes to people doing stainless and copper alloys.

Steve Loudermilk
- Springdale, Arkansas

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