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The sodium hydroxide solution has to be boiling hot to help strip the cured paint off. You should do it in a stainless steel pan or pot, and be VERY CAREFUL! Use gloves and work slowly. Don't breath the fumes and have good ventilation. The paint should strip off in a few mins while the pcb is simmering.
Yes the pcb traces are inverted in EAGLE. Thank you for the kind words!
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