Our boats are just like any other two sided object with one warm side, and one cold side... The warmest side will have the moister, just like the outside of a beer bottle... So, to keep it to a minimum particuarly when it is real cold outside, I just have to leave a couple of windows slightly open a bit, and I have found that keeping a fan blowing all the time really helps too. Very interesting on the liner...but my worry would be for mold/mildew in the fabrics... Thought I smelled gas in my forward bunk before and it turned out to be mildew smell coming from the fabric on the bunk pads... Will be interesting to see what others have to allow on this.. Good Topic..