I recently needed a pen that would write on aqueous coated card stock, which as you know, is pretty difficult to do reliably.
In the process of searching I came across:
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I do believe this pen will write on anything. Dries instantly, so good for lefties too.
They don't pay me to say it, but this pen is fantastic. I guess if I'm getting this excited over a marker, I need to seriously reconsider my options and priorities.... Ha!! :)
Anyway, I haven't tried it yet, but I'll bet these work great on circuit boards too.
-mpm