I used this pen to darken the engraving on some medical grade stainless steel bracelets. It works very well and I am happy with the product. But I've learned a few things. Thoroughly clean the metal with alcohol before starting work, especially if you have already worn or used the item. Allow the alcohol to dry completely. Generously paint over the engraving and set the timer! Wipe off excess material with semi-absorbent, heavy-duty paper, such as printer paper. Do not wipe with a handkerchief or cotton ball, you will soak up most of the paint. There is no law against applying a second coat. Package instructions don't go into detail, but learning by doing is good. I am considering covering the engraving with clear nail polish as the paramedic alert bracelets are very worn. I'll update this if the nail polish idea is good.
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