Re: New Northeast Liveboard - First Condensation/Mildew Battle
Stuff tight fitting sheets of 1 inch or thicker white styrofoam up into the hatches. The light will shine right thru , but it will minimize heat loss and condensation. Ethafoam is more expensive ,but tougher.
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"