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@PR4UK ah I see what you mean. I've used this technique to successfully etch a design deep in steel. I bet any kind of film or covering would work, this one uses nail polish and a a small electric current. https://youtu.be/U0wTNdgL2Uc
@PR4UK ah I see what you mean. I've used this technique to successfully etch a design deep in steel. I bet any kind of film or covering would work, this one uses nail polish and a a small electric current. https://youtu.be/U0wTNdgL2Uc