Hi Rod -

Any conformal coating known to man is, at best, a vapor permeable barrier.
They will all absorb and pass some amount of moisture, particularly when
confined in an environment such as you describe.  When caught early enough in
this process, the moisture can often be removed by baking the assembly at a
low temperature (whatever the components can withstand).  The assembly you
describe sounds as if it is in pretty rough shape, and may also have
considerable moisture entrained in the circuit board and plastic components.

The question then becomes whether or not it is economically feasible to strip,
dehumidify, retest and recoat the assembly.

Regards - Kelly

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