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Paul,
The downside of conformal coating is that it makes PCAs difficult to rework or repair but that doesn't matter if they're going to stiff you for a complete new one anyway. Hopefully, it will solve your corrosion problem.
The cost of conformal coating at time of manufacture is relatively small. It's a shame that few "amateur" astro products seem to be designed with their typical usage in mind. Brett makes some good points.
Cheers,
Rick.
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