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Hi Paul,
sorry to hear all about that corrosion problem.
I am an electronics technician & have conformally coated 100s of PCBs.
Yes - conformal coating is a wise move.
It is a hard process to properly mask everything & also to not have the coating
leak underneath the masking tape.
However - it is sensible to use non-acidic silicone such as Dow Corning 738
because most of the others have an acidic cure & will damage the metal on a PCB over time.
cheers
Allan
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