I have these paint markers for car stuff and figured I would try it out on the Harmonica seeing as Hohner hasn’t put the Key on the sides. It’s oil based and if it starts to rub off, just reapply. Just figured I would throw it out there
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I used to do that but you can’t see them in a dark venue, so I buy these luminous green stickers about as wide as a harp and apply them to the top then I use modeling varnish to waterproof them. In fact I did one just this morning IMG20250125140325|225x500
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It works for me @Andy2 . I can see it just fine. 
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@Andy2 I could see it. and can def see the second picture. That looks like a great idea as well.
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I dont like stickers because they move or come off eventually then you have a sticky spot. The paint pen you have works best if you use it, wait until it’s really dry then paint clear nail varnish over the top one stroke each line not over and over or it smudges.
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Nope because I use modeling varnish that not only keeps em in place but water proofs them too
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