It may be too cold in the winter to have airborne moisture, depending on where you store it, but if that's an issue go to Lowe's, Home Depot, whatever and get some Dri-Z-air. They're white pellets that go in a cage like device with a catch bucket under it, the whole thing is a bit bigger than an old oil can. As the pellets absorb the moisture they desolve and form a slightly gooey fluid in the catch bucket. Periodically take it out of the interior and pour off the liquid, and renew the pellets when necessary. Does a good job of preventing mold/mildew on the interior.