Stop in for a cup of coffee

I’m probably to fussy, tried this also, the paint on letters wrap around to the base of sign in crisp straight edge. What is a acid brush?
I have seen the license plate guys do it with a solid rubber roller like a old printer would spread ink on the letters?

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Acid brush and carefully apply grease or Vasaline around the letters.
Wipe Tham clean when the paint s dry