I work for a boat storage facitlity in Iowa and we are currently working on shrink wraps. For the 3 years we have do these, we have not had any moisture/mildew problems come spring. But we also make sure that every boat we shrink does not have any water in the carpet or in the seats! We highly recommend doing this, as we do 100+. If you have any questions, just ask. And if you decide to use a heat gun, it is going to take a while. We use a flame gun that shrinks the boat pretty quickly, but still takes about an hour after all is done. And you also have to vent the boat so that you get air flow in the boat over the winter. This also helps with the moisture/mildew.
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