RE: "Sweating" steel boat
Yes, we left it unattended for a week or so at a time. It had been left on its own for an extended period and things were pretty damp, not wet but it was pretty darn humid.
We use large DH units on big ships when we lay them up and it keeps them in fabulous condition, no rust, no corrosion so we decided to DH the little boat and found it really works great. The DH is part of the boat's gear now. We got one that*allowed us to*adjust the humidity desired so we weren't trying to dry out the world, just the boat.