Worked for me, stayed on in the (hand)wash - perhaps the previous reviewer was using a surface that was varnished with something that was resistant? I just used a pound store plain white ceramic mug. I didn't try washing it until a couple weeks later, so I don't know how it fares at 3 days, but it seemed hardened by then. I was actually surprised that it was as easy to use and stayed on, as promised! I don't know yet how long lasting it is over a longer period of time, but it survived the first wash just fine. I know this is the 1-2 mm nib, but even so, it felt a bit thicker than 2mm, so the line is rather thick and therefore not terribly precise.
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