Seasonal Commissioning and Decommissioning

Spring Commissioning — Bottom Paint and Below-Waterline Prep

Spring commissioning begins weeks before the boat touches the water, and the hull work is the most time-critical part of the process because it must be completed before the launch date. Start with a thorough visual inspection of last season's bottom paint. You're looking for bare spots where the paint has worn through to the barrier coat or gelcoat, areas where the paint has peeled or delaminated from the substrate, heavy buildup zones (usually around the waterline and keel) where multiple years of hard paint have created a thick, cracking layer, and any blisters that have appeared over the winter.

If your bottom paint is ablative (Micron CSC, Hydrocoat, or similar), the surface should have worn down to a thin, relatively uniform layer. Sand lightly with 80-grit on a random-orbit sander to remove any remaining chalk and provide tooth for the new coat. If bare spots exist, check the barrier coat beneath — if it's intact and well-bonded, apply a coat of bottom paint directly. If the barrier coat is compromised (flaking, soft, or showing moisture), you have a bigger problem that needs to be addressed before painting. If your bottom paint is hard (Trinidad, Trilux, or similar), check for thickness buildup. Hard paints don't wear away, and after 5-8 annual applications, the paint film becomes so thick that it cracks, peels, and defeats its own purpose. If total paint thickness exceeds 10-12 mils, it's time to strip to bare substrate and start fresh.

Bottom paint application is straightforward but demands attention to detail. Stir the paint thoroughly — antifouling biocide settles to the bottom of the can and needs to be fully incorporated. Use a solvent-resistant roller cover (3/8-inch nap foam or microfiber), and apply two coats with the manufacturer's recommended drying time between coats (typically 4-24 hours depending on temperature and product). Apply an extra third coat to high-wear areas: the leading edge of the keel, the rudder leading edge, the waterline, and areas around running gear. Mask the waterline with 3M Fine Line 218 tape before painting — the crisp boot stripe line that separates bottom paint from topsides is one of the details that distinguishes a well-maintained boat.

Apply the final coat of bottom paint as close to launch day as possible. Most antifouling paints begin losing biocide effectiveness once they've been dry and exposed to air for more than 30-90 days (check your specific product's data sheet). A boat that was painted in March for a June launch has already burned through a significant portion of its antifouling protection before it ever touches the water. Ideally, the final coat goes on 1-7 days before launch.

Before painting, address any gelcoat damage found during winter storage. The dry hull is the ideal time for gelcoat repairs — moisture meter readings are at their annual low, and repairs can cure fully in the controlled conditions of the boatyard. Fill chips and gouges with gelcoat paste (color-matched to your hull) or epoxy filler if the damage extends into the laminate. Sand fair, feathering the edges into the surrounding surface, and apply barrier coat over any repaired area before bottom paint goes on.

Spring Commissioning — Zincs, Through-Hulls, and Seacocks

Replace all sacrificial anodes at spring commissioning regardless of their apparent condition. Zinc anodes that have been out of the water all winter may have developed a passive oxide layer that reduces their effectiveness even though they look like they have metal remaining. Fresh anodes are cheap ($5-$25 each depending on size) and guarantee full cathodic protection from day one of the season. If your boat uses aluminum or magnesium anodes instead of zinc (required in some freshwater and brackish environments), the same replacement schedule applies.

Inspect every through-hull fitting and seacock before launch. From outside the hull, check each through-hull for signs of deterioration — dezincification (pinkish discoloration on bronze), corrosion around the hull penetration, and condition of the external fairing. From inside, exercise every seacock by opening and closing it fully several times. Seacocks that haven't been operated all winter may be stiff — never force a frozen seacock with a wrench, as you can snap the valve handle or crack the fitting. Instead, apply penetrating oil (PB Blaster or Kroil), let it soak for 30 minutes, and work the handle gently with increasing effort. If a seacock will not operate with reasonable hand force, it needs to be rebuilt or replaced before the boat goes in the water.

Lubricate seacock shafts with waterproof marine grease after exercising them. Traditional tapered-plug seacocks (like Groco) need the plug withdrawn, greased with marine valve grease, and reinstalled with the proper compression adjustment. Ball-valve seacocks are simpler — grease the shaft and operate several times to distribute the grease. Apply a thin film of Lanocote or waterproof grease to the external bronze surfaces of each through-hull to slow galvanic corrosion.

Check every hose connection to every through-hull. Verify double hose clamps (two all-stainless clamps at every connection below the waterline — this is an ABYC requirement, not a suggestion). Check the hose material — look for cracking, hardening, or swelling, all of which indicate the hose is aging and needs replacement. Squeeze the hose near the fitting: a pliable hose that springs back is fine; a stiff hose that holds the compressed shape or cracks when bent is overdue for replacement. Exhaust hoses near the waterline are particularly critical because they carry hot, acidic exhaust water and degrade faster than raw-water hoses.

Inspect the rudder post seal (stuffing box or lip seal) and the prop shaft seal. A conventional stuffing box should show a slight drip (1-2 drops per minute under power) when properly adjusted. A drip-free shaft seal (PSS or Tides Marine SureSeal) should be checked for bellows condition, hose clamp security, and proper alignment. The rudder post seal — often a simple packing gland or lip seal — should be checked for leaking and proper compression. These seals are your last defense against water entry at two of the largest hull penetrations on the boat.

Fall Decommissioning — Haul-Out, Wash, and Assessment

Fall decommissioning is when you assess the season's toll on your hull and set the boat up for safe winter storage. The single most important decommissioning task is the pressure wash immediately after haul-out. Marine growth that dries on the hull becomes cemented in place and can only be removed with aggressive scraping that damages the bottom paint. Pressure wash the bottom at 2,000-3,000 PSI within the first hour of the boat coming out of the water — most boatyards include this in the haul-out fee or do it automatically as part of their process.

While the hull is still wet and freshly washed, do your initial damage assessment. Walk the entire bottom, looking for areas where the paint has worn through, new blisters, impact damage, and coating failures. Check the keel-to-hull joint for any new cracking or separation. Inspect the rudder for dings, gouges, and any sign of water saturation (a waterlogged rudder feels heavy when moved by hand and may show cracks where water has frozen and expanded). Mark all findings with wax crayon — they'll be harder to see once the hull dries and the inevitable dirt and dust of boatyard storage settles on the surface.

After the hull dries (give it 48-72 hours in fall weather), take moisture meter readings across the entire bottom on the same grid pattern you use for spring inspection. Fall readings are your end-of-season baseline — they show how much moisture the hull absorbed during the season. Compare them to your spring readings from the same locations. A hull that started the season at 8% average and is now reading 12% average has absorbed a normal amount of moisture. A hull that started at 8% and is now reading 25% in certain areas has a moisture intrusion problem that needs investigation during the winter storage period.

Open every seacock and leave them in the open position for winter storage. This counterintuitive step has a specific purpose: a closed seacock with trapped water in the valve body can freeze and crack the fitting. An open seacock allows water to drain and air to circulate through the valve. Some owners remove seacock handles during winter storage to prevent accidental operation — if you do this, tie the handles to the seacock body with a lanyard so they're there when you need them in spring.

Drain all water from hull systems that are exposed to freezing. This means raw-water cooling systems, head plumbing, freshwater tanks and lines, and any hose runs that hold water. Use compressed air to blow out lines that cannot be fully drained by gravity. Add non-toxic antifreeze (propylene glycol, not ethylene glycol) to any system that may hold residual water — heads, raw-water strainers, and low points in hose runs. A single freeze event can crack a bronze through-hull, split a hose, or burst a heat exchanger — and you won't discover the damage until spring, when water floods in on launch day.

Winter Storage — Covers, Cradles, and Blocking

How a boat is stored for winter determines whether it emerges in spring with minor cosmetic cleanup or with structural damage from poor support, moisture entrapment, or ice loading. The hull must be properly supported — and this is where yard practices vary enormously in quality. The correct setup uses a purpose-built cradle or a system of jack stands (minimum 4, preferably 6 for boats over 30 feet) on a firm, level surface with the keel resting on blocking that distributes the keel load over a sufficient area.

Jack stand placement is critical and boat-specific. Stands must contact the hull at structural hard points — bulkhead locations, engine bed areas, and structural floor timbers. Stands placed between structural members rest against unsupported hull panels and can create point-load damage — dents, gelcoat cracks, and even laminate fractures if the hull panel flexes under load during freeze-thaw cycles or wind loading. The stands should be chained together (jackstand chains run through the pads and around the keel) so they cannot kick out independently. Pads between the stands and hull should be thick enough to distribute the load — carpet-wrapped wood blocks or commercial stand pads are standard.

Shrink-wrap vs. canvas covers vs. frame-and-tarp is a perennial debate. Shrink-wrap provides excellent weather protection, sheds snow loads effectively, and creates a sealed interior environment. The downsides: it traps moisture inside unless ventilation ports are installed (and they should be — at least 4-6 vents per wrap job), it's a single-use plastic product, and it costs $12-$25 per foot of boat length per season. Canvas or Sunbrella covers are reusable for 10-15 years, breathable, and more environmentally sustainable. They cost $2,000-$5,000 for a custom-fitted boat cover but pay for themselves in 3-5 years compared to annual shrink-wrapping. Frame-and-tarp is the budget option — a PVC or wood frame with lashed tarps. It works adequately but requires maintenance through the winter to prevent tarp failure under snow loads.

Ventilation during winter storage is essential regardless of cover type. A sealed boat with no air circulation builds up condensation inside as temperatures fluctuate. That condensation promotes mold growth on interior surfaces, corrodes electronics and metal fittings, and can saturate wood structural members. Open hatches slightly (if the cover allows), install solar-powered ventilators, or use a low-wattage dehumidifier on a timer if shore power is available. The goal is continuous air exchange that prevents moisture from condensing on cold surfaces.

Support the mast properly if it's stored on the boat or alongside. A mast stored on sawhorses alongside the boat needs support at intervals close enough to prevent deflection — typically every 8-10 feet for an aluminum mast. The mast should be level and the supports padded to prevent point-load damage. Cover the mast step area on the deck to prevent water pooling and deck core saturation. If the mast is stepped through the deck, seal the partner opening with a fitted cover or plug.

The Critical First-Launch Inspection Checklist

Launch day is the most dangerous day of the sailing season for hull integrity. The boat is going from a dry environment into water for the first time in months, and every seal, joint, fitting, and penetration is being tested simultaneously. The first-launch inspection is not a casual glance around the cabin after splashdown — it is a systematic, time-critical check of every below-waterline system that must happen within the first 30 minutes of the boat being in the water, while someone remains aboard continuously.

Before the boat goes in the water, conduct the pre-launch walkthrough on the hard. Verify all through-hull seacocks are in the closed position (you opened them for winter — now close them). Confirm all drain plugs are installed (if applicable — some boats have hull drain plugs for self-bailing cockpits). Verify the prop shaft seal or stuffing box is properly adjusted. Check that the rudder post seal is secure. Double-check that all hose clamps below the waterline are tight. Look under the boat one final time — are there any open holes, missing fittings, or disconnected hoses? The pre-launch walkthrough is your last chance to find problems before they become emergencies.

The moment the boat is in the water, get aboard and go below immediately. Start at the deepest point of the bilge and work outward and upward. Check for water — any water. A small amount of weeping around the prop shaft stuffing box is normal on a conventional packing gland. Everything else should be dry. Check every through-hull from inside — look at the hull around each fitting for dripping, run your finger around the hull-to-fitting junction, and look for water trails. Check the keel bolt area in the bilge sump. Check the rudder post seal. Check the bilge every 15 minutes for the first two hours after launch. This catches slow leaks that are not immediately visible but accumulate dangerously over time.

Open seacocks one at a time, starting with the least critical. As you open each seacock, watch the fitting and hose connection for leaking. With the seacock open, water pressure is on the fitting and hose — a hose that held pressure all winter with the seacock closed may weep or spray when water pressure is applied through the seacock. If any fitting leaks, close the seacock immediately and address the leak before proceeding. Do not open all seacocks simultaneously — if multiple fittings leak at once, you'll be overwhelmed trying to manage multiple water sources.

During the first sail of the season, check the bilge again after the boat has been heeled, pounded through waves, and subjected to the dynamic loads of sailing. Static leak tests at the dock don't reveal leaks that only appear when the hull is flexed under load. Stuffing boxes that were dry at the dock may drip under power when shaft vibration works the packing. Through-hull fittings that were dry in flat water may weep when the hull flexes under sailing loads. The first-launch inspection isn't complete until the boat has been sailed hard and checked thoroughly afterward.

1. Pre-launch walkthrough on the hard

   Close all seacocks, install drain plugs, verify shaft and rudder seals, confirm all below-waterline hose clamps are tight, visual check for any open holes or disconnected fittings.

2. Immediate below-decks inspection at splashdown

   Go below within minutes of launch. Start at the deepest bilge point and check every through-hull, keel bolt area, rudder post seal, and shaft seal for any water entry.

3. Sequential seacock opening

   Open seacocks one at a time, starting with least critical (cockpit drains). Watch each fitting and hose for leaking under water pressure. Close immediately if any leak is detected.

4. 15-minute bilge checks for first two hours

   Monitor bilge water level every 15 minutes during the first two hours afloat. Any accumulation beyond normal stuffing box drip requires immediate investigation.

5. Post-first-sail inspection

   After the first sail under real sailing loads, check bilge again. Dynamic hull flexing under sailing loads can reveal leaks that are not present at the dock.