The main reason I bought them was to use them to write on the galvanized (galvanized) plant markers in my flower beds and gardens. They work very well for that. The ink holds up very well, and because they have fine dots, they produce legible text that isn't too thick or smudged. I've also used them on a flea market sign and on a tree; and intends to use them on glass as well (an application suggested by Sharpies). Since it's actually paint I don't see why it can't be used to touch up black items that might need it. - Cans of paint that you can hear and feel when you shake the pen a little to get it ready to use. Once you do this, and after priming the pen for the first time (by repeatedly pressing the tip against the surface to get the paint on the tip), the paint pen "writes" very well. Using a touch-up stick works much better in many cases than paint in small glass bottles with touch-up brushes attached to the lid.
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