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Can you tell us why? I have several home-etched pcb´s with no coating at all and they still work even after 10+ years.I can not have bare copper for most of my projects...
I can not tell you any thing as I don't no my self all I no is I make the board I clean it and lacquer after a day or two I can not see copper two of my projects did not work because of oxides one off them is a home made computer when i replace the board it ok
It is unclear why the coating is not working.
Rant on:
It is a bit irritating when people fail with a process that should work and go off seeking alternatives. It is far better to understand why it failed prior to moving on to another process. The same problem may well cause problems with the next process.