cornytheclown ) writes:

Those Dalo pens are nothing but lacquer pens... Sharpies, laundry
markers....even other brands of common permanent markers will
work..........you can get by cheaper and have a better supply of tip
sizes from ultrafine for smt work to xtra large that will cover ground
planes nicely. Other permanent markers will also work. Stadtler pens
are nice too, dont know their chemical makeup but they are tougher to
remove than sharpie lacquer pens with solvents.

There was an article in Ham Radio, in the late eighties or so,
when someone wrote about using common pens for etch resist. He
mentioned adding some rubbing alcohol to the ink (ie pull open
the pen, and put in a bit of it) to make the ink flow better.
I know I tried it at the time, and the ink did apply better. I
can't remember if I ever etched boards with such a souped up pen.

Michael VE2BVW