I spray automatic transmission fluid in all the cracks and gaps to keep condensation out. Transmission fluid creeps so it does a good job of coating the metal and won't damage the rubber. I know Will coats the underside of his car with oil for the same reasons. The bags I have seen have a computer fan which circulates air through the inside of the bag which prevents condensation from forming. They had a buick in one the bags at an auction out in the rain and it was dry inside. Well worth the money, keeps the dust off as well.
Richard T.
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