I am trying my first pcb and to start build a pcb for small sensor.
The negative senstive board on market is too thick and I got much
bare thin Cu cladded board without.

I find
http://www.philmore-datak.com/DATAK.htm
has er-71, can give negative photo resist. ER-71 should be what I
am looking for. But strangely I found, no one here using this norminally
saying good stuff. At least, it is cheap and easy to exposure under sun.
please give comments to this magic liquid ER-71.


BR,

Paul

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