The Boat Dehumidifier That Runs On Nothing

A cabin sealed under shrink wrap is a humidity trap. Water vapor comes off the bilge, the upholstery and the hull itself, condenses on every cold surface overnight, and runs back down into the lockers. By spring you have mildew on the headliner and a boat that smells like a wet basement.

An electric dehumidifier only helps if the boat is on shore power all winter and someone empties the reservoir. Sta-Dri is a passive desiccant dehumidifier — montmorillonite clay in a breathable pouch that pulls moisture out of the air with no power, no hoses and nothing to overflow.

• Winter layup, shrink wrap and dry storage.
• Cabins, V-berths, lazarettes, lockers and engine spaces.
• On a mooring, where there's no shore power at all.
• Non-toxic and non-flammable — safe near fuel and in a closed cabin.

Size by enclosed volume: 1 pound per 13.3 cubic feet. The chart below is a starting point by LOA. Add a small pack to each locker and the anchor well — those hold their own damp air. To size it exactly, use the Sta-Dri calculator.

Dry the boat before you seal it. Packs handle airborne moisture; they can't out-absorb a leaking hatch or a wet bilge.

1. Pump and sponge the bilge dry, and leave the bilge access open.
2. Open every locker, drawer and cabinet door so air can move between them.
3. Stand cushions on edge or take them home.
4. Set XL packs low in the cabin — cold air and moisture settle.
5. Put a small pack in each closed locker, the head, and any electronics case.

In spring, recharge them in your oven and put them away for next season.

Yards and dealers shrink-wrapping a lot of boats order Sta-Dri in bulk. Tell us how many hulls you cover and we'll work the quantity and pricing with you.