Just had another idea. How about coating the PCB with a very thin layer of laser printer toner. A powder coating set up would work well for that i.e. uniform electrostatic attraction of the particles to the copper. Then use a laser diode on a CNC mill or flatbed plotter to fuse the resist to the board. I also thought that powder coat paint might work but it requires a long heat cycle to cure it properly. It may be time to destroy an old CD burner and try this. Any thoughts?? Sage
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Another approach for lasers
2012-02-25 by drsage2007