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Actually, yes, repeated cycles of humid warm days with cool nights, will essentially act like a pump and water will accumulate. Built instrument cases for tractor trailers and ocean racing sail boat applications by the thousands over the years and always made sure there were breathing/drain...

Silicone will not seal out the water molecules. The case will breathe the ambient air unless you have a hermetic seal. Let warm, dry ambient air take care of the fog, like mentioned by rosco. In the end the only practical solution is a vented case.