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The traditionally green coating which protects copper on PCBs from oxidation and shorting due to solder. Use this tag for PCB design questions and soldering questions which require attention to the mask layer.
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What effect does using two different forms of solder mask on the same PWB have?
We found some PWBs that seem to have both film and liquid solder mask applied on the board. I have never encountered this before and was curious to see if this is acceptable for use.