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Old Nov 07, 2012, 01:29 PM
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Letchworth, Great Britain (UK)
Joined Jul 2004
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Question
Best etch-resist pen for PCB?

I bought a starter kit for making my own PCBs a while back, and over the past couple of days I've eventually got around to making a couple. I've been hand-drawing the tracks on the copper with the supplied pen -- a Staedtler permanent Lumocolor -- and have had good results (within the limits of my drawing capability) apart from one thing:

Each time my etch has taken about 20 minutes, using sodium persulphate solution. But each time I've had to twice remove the board from the solution, wash it, dry it, and then re-apply the pen because the ink has been eroded by the etch solution in places, and copper is showing through.

So, any advice please on what is the best pen to use? Do you normally have to touch-up your tracks during an etch?
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