How do I prepare my boat for summer storage?

Properly preparing your boat for summer storage is a critical investment in its longevity, performance, and safety. Unlike winterization, which focuses on protecting against freezing, summer preparation guards against heat, humidity, UV exposure, and biological growth during periods of inactivity. A systematic approach can prevent costly repairs and ensure your vessel is ready for your next outing.

Comprehensive Cleaning and Dewatering

Begin with a thorough cleaning, inside and out. This removes corrosive salts, organic materials, and dirt that can cause damage over time.

• Hull and Deck: Wash the hull, deck, and topsides with a marine-specific cleaner. Apply a quality wax to fiberglass surfaces to create a protective barrier against UV rays and oxidation.
• Interior and Upholstery: Clean all interior surfaces, cabins, and bilges with a mild detergent. Remove any food items to deter pests. Clean vinyl and canvas with appropriate products and allow them to dry completely before storage to prevent mold.
• Bilge and Plumbing: Pump the bilge dry and clean it with a bilge cleaner. Flush freshwater systems and consider adding a non-toxic antifreeze rated for potable water systems to prevent stale water odors and bacterial growth.

Engine and Mechanical Systems Preparation

Protecting the engine and drive systems is paramount, even in warm weather.

1. Fuel System: Top off the fuel tank to minimize condensation, which can lead to water contamination and microbial growth. Add a fuel stabilizer formulated for ethanol-blended fuels, run the engine for 10-15 minutes to circulate the treated fuel through the entire system.
2. Engine Maintenance: Change the engine oil and oil filter. For stern drives and outboards, change the gear case lube. Inspect coolant levels in freshwater-cooled engines.
3. Impellers and Belts: Consider replacing the raw water pump impeller if it is nearing its service life, as a dry-rotted impeller can fail upon restarting.
4. Batteries: Disconnect the batteries, clean the terminals, and store them in a cool, dry place on a maintenance charger or tender. Allowing a battery to sit discharged in high heat can permanently damage it.

Interior and Systems Shutdown

Secure the boat's interior and onboard systems to prevent damage and battery drain.

• Electronics: Remove portable electronics like chartplotters, VHF radios, and fishfinders if possible. For fixed units, ensure they are powered down.
• Ventilation: Promote air circulation to combat mold and mildew. Install passive cabin vents or dehumidifier products like moisture-absorbing containers or electric dehumidifiers if shore power is available.
• Seacocks and Through-Hulls: Close all seacocks. Inspect hoses and clamps for brittleness or cracks.

External Protection and Covering

The right cover is your boat's first line of defense against summer elements.

A breathable, fitted fabric cover is ideal. It should shield the boat from sun and rain while allowing air to pass through to reduce heat buildup and moisture entrapment. Avoid non-breathable plastic tarps, which can create a greenhouse effect and promote condensation and mold. Ensure the cover is well-supported with a frame or poles to prevent water pooling.

Choosing and Preparing the Storage Location

Your storage method dictates specific preparation steps.

Dry Stack or Indoor Storage

These offer excellent protection from sun and weather. Ensure the boat is completely dry before covering to prevent trapping moisture. Remove all loose gear and valuables.

Outdoor Storage (Yard or Marina)

This is the most demanding environment. In addition to a quality cover, consider applying UV protectant to all exposed rubber, vinyl, and plastic fittings. If storing on a trailer, ensure the tires are inflated and protected from sun exposure with covers, and that the trailer frame is supported with jack stands to relieve pressure on the tires and springs.

In-Water Slip Storage

For boats staying in the water, preparation focuses on preventing marine growth and checking systems. The hull should be clean and have a fresh coat of antifouling paint. Double-check all bilge pumps and automatic float switches. Increase the frequency of hull and zinc anode inspections throughout the season.

Final Checks and Documentation

Before leaving your boat, conduct a final walk-through. Verify all hatches and ports are closed but not locked airtight to allow for ventilation. Secure all drawers and doors. Take photographs of the prepared boat and its condition for your records and potential insurance documentation. Notify your storage facility of your departure and provide emergency contact information.

Adhering to this preparation checklist requires time and effort, but industry findings consistently show it significantly reduces the risk of deterioration and unexpected repair costs. Always consult your owner’s manuals for model-specific guidance and confirm any unique requirements with your chosen storage facility. A well-prepared boat is a vessel that will provide reliable enjoyment for seasons to come.