[lazylester]

Is condensation a problem in a freezer? There is no moisture in the air b/c the temp is less than freezing, no?

Condensation happens when moist air hits a cool surface, how much power is your circuit consuming? You may not have a problem.

I have designed a number of telephony products (e.g. T1 repeaters) for use in outdoor environments, we never coated the circuit boards.