like that would work well, you could get that nice and air tight.
Perhaps he should fill it with silica gel to absorb the moisture.
A couple of guys on other forums take this approach, but stick there entire setup inside a properly sealed box, suck out the air using a proper vacuum pump and then replace the air with nitrogen. Condensation comes from the humidity in the air, remove the air, remove the condensation. Simple.
]JR[