I think it's a little optimistic to expect a perfect seal. You're still going to have quite a few electrical connections and these aren't designed to be air tight. Perhaps you would consider a "nitrogen pad".
We used these on hot oil systems where oxygen would cause accelerated degradation of the heating oil. Think ~5000 gallons of cooking oil heated to ~550°F and flowing around 500 gpm. The system could not be completely sealed due to the change in volume heating that much oil from room temp to 550°F. We used an expansion tank with relief valve (~5 psig) to handle the initial expansion and had a bottle of nitrogen connected at ~1 psig. You don't need much positive pressure, but any "gap" would have nitrogen flowing out rather than exchanging with ambient air.
A dessicant could be added as an additional safeguard.
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