Dmitry Shteyn — Preserving Your Inventory: Sail Care and Storage for the Wisconsin Winter

The Hidden Enemy of the Off-Season

When we pull our boats out of Lake Michigan or the inland lakes in late October, the focus is usually on the engine, the hull, and the plumbing. But for many sailors in Wisconsin, the sails are the most valuable pieces of equipment on the boat, and they are often the most neglected during the winter months.

I’ve seen it time and again at the yacht clubs in Milwaukee and Madison: a sailor leaves their main flaked on the boom under a canvas cover all winter, or tosses a damp spinnaker into a plastic bin in an unheated garage. By May, those sails have lost their shape, developed mildew, or worse, become a nesting ground for rodents. If you want to maintain your boat speed and avoid a massive replacement bill, you need a disciplined end-of-season routine.

Clean and Dry: The Golden Rule

Before you even think about folding your sails, they must be clean and completely dry. Salt is a major issue for Great Lakes sailors who might have spent a weekend in the spray of Lake Michigan. Even though it's freshwater, the mineral content and local pollutants can stiffen the fibers. On an inland lake like Lake Mendota, the concern is often organic matter—lake weeds and microorganisms that thrive in damp folds.

I recommend a gentle rinse with fresh water. Avoid high-pressure washers, which can damage the resin coating on Dacron or delaminate high-tech fibers. Once rinsed, the sails need to be dried. In Wisconsin, this can be tricky because the humidity spikes in the fall. Do not roll them up if they are even slightly damp. A damp sail in a bag is a recipe for mildew, which is nearly impossible to remove from laminate sails without damaging the glue.

The Detailed Inspection

Winter is the best time to act as your own sailmaker. Spread the sail out in a clean, dry space—a basement floor or a local gym if you have access. Look for:

• Chafe points: Check the spreader patches and the areas where the sail contacts the life-lines or stanchions.
• UV Damage: Inspect the leech and foot. If the thread snaps easily when you pick at it with a fingernail, the UV light has compromised the structural integrity.
• Hardware: Check the slugs, slides, and batten pockets. Look for cracks in the plastic or corrosion in the metal clips.

One concrete example comes from a J/24 team I coached last year. They ignored a small 1-inch tear near the headboard during their October haul-out. During the first heavy-air regatta in May, that tiny tear turned into a full-width failure, ending their weekend. Catching these small issues in December gives you plenty of time to get them to a professional loft before the spring rush.

Storage Environment and Rodent Protection

The environment where you store your sails is just as important as how you fold them. In Wisconsin, our temperatures swing from 40°F down to -20°F. While the cold itself doesn't hurt Dacron, the temperature fluctuations can cause condensation if the sails are stored in a non-climate-controlled shed.

Ideally, store your sails in a climate-controlled, dry basement. If you must store them in a garage, keep them off the concrete floor. Concrete wicks moisture and attracts rodents. I once saw a beautiful Kevlar racing jib ruined in a Menasha garage because a mouse decided the sail bag was the perfect place for a winter nest. Use plastic totes with tight-fitting lids, but only if you are 100% sure the sail is dry.

Folding vs. Rolling

For racing sails, rolling is always superior to folding. Folding creates creases that eventually weaken the fibers and break down the finish that gives the sail its "crunch." If you have the space, roll the sail from the head down to the foot. If you must fold, use a loose "flaking" method and try to stagger the folds each year so you aren't creasing the exact same spot every winter.

Safety and Rules Compliance

While sail care is mostly about maintenance, remember that the Racing Rules of Sailing (RRS) assume your equipment is in safe, working order. Under Rule 1.2, a boat is required to carry adequate life-saving equipment, but having a mainsail that can be reefed or dropped quickly is also a fundamental safety requirement. A seized slug or a rotted halyard attachment can turn a simple gust into a dangerous situation on the water.

By taking care of your inventory now, you ensure that when the ice breaks and the first warm breeze hits the Great Lakes, you're ready to hit the line with confidence and speed.