As the boating season ends, it’s time to think about winterisation.

When the nights draw in and the temperature drops, every UK boat owner faces the same task: protecting their boat for the winter. Whether your vessel stays afloat in a marina, rests in dry stack storage, or sits safely at home, a thorough winterisation routine ensures your boat weathers the cold months — and minimises its environmental footprint.

In this guide, we’ll cover practical steps to safeguard sailing yachts, motorboats, and RIBs alike — and how to prepare for any winter upgrades with help from SALT’s flexible boat finance.

Clean and Protect — The Eco-Friendly Way

Start with a deep clean to prevent corrosion, mould, and staining.

  • Rinse hull and topsides with fresh water, using biodegradable, phosphate-free cleaners. Avoid harsh chemicals that can harm marine life.
  • Polish and wax the hull to add a protective layer against winter moisture and salt.
  • Clean the deck and fittings thoroughly, ensuring drains and scuppers are clear of leaves and debris.
  • Inside the boat, wipe down surfaces with natural cleaning solutions (like vinegar-based sprays) and remove soft furnishings for storage in a dry place.

If storing outdoors, use a breathable, reusable cover rather than disposable plastic sheeting. It’ll keep your boat dry while reducing waste.

Check out August Race and their sustainable range of boat cleaning products.

Engine and Fuel System Care

Engines dislike being idle in damp, cold conditions — so preventative care now saves costly repairs later.

For inboard and outboard engines:

  • Change engine oil and filters to remove contaminants that could corrode internal components.
  • Flush the cooling system with fresh water and eco-friendly antifreeze designed for marine use.
  • Top up the fuel tank to reduce condensation, and add a biodegradable fuel stabiliser to prevent degradation.
  • Run the engine briefly to circulate antifreeze throughout the system.

For outboards, store them upright to ensure water drains completely, and lubricate moving parts with marine-grade grease.

Drain and Safeguard Your Water Systems

Frozen water can crack pipes, pumps, and fittings. To prevent this:

  • Drain all freshwater systems, including tanks, calorifiers, and hoses.
  • Use non-toxic, environmentally safe antifreeze in bilge pumps, heads, and shower drains.
  • Open seacocks where safe to allow drainage and prevent trapped water from freezing.

If you’re keeping your boat in the water, consider a bilge heater or dehumidifier to prevent damp — ideally one with low energy consumption or powered via a smart timer.

Electrical Systems and Batteries

Cold, damp conditions can drain batteries fast.

  • Fully charge all batteries before storage and disconnect them.
  • Store indoors in a cool, dry space if possible, using a solar or smart trickle charger to maintain charge without wasting energy.
  • Inspect connections and apply protective spray to prevent corrosion.

For boats afloat, ensure shore power cables are safe, dry, and weather-protected.

Sails, Canvas, and Upholstery

Moisture and mildew are the enemies of fabric and canvas.

  • Remove sails, covers, and sprayhoods and store them in a dry, ventilated space.
  • Inspect stitching, zips, and seams, and take advantage of the winter months to get repairs done.
  • Clean and air out cushions and soft furnishings, and store them indoors if possible.

For eco-minded sailors, use mild detergents and avoid fabric sprays containing microplastics or harsh solvents.

Hull and Propeller Maintenance

While your boat is ashore, give the hull and running gear a close inspection.

  • Clean off barnacles and growth using plastic scrapers or gentle tools that won’t damage the gelcoat.
  • Inspect anodes and replace any more than half-worn to prevent galvanic corrosion.
  • Check the propeller, shaft, and rudder for wear or damage.

If you’re reapplying antifouling, consider switching to a biocide-free or low-toxicity antifoul paint — better for the marine environment and compliant with the latest UK regulations.

Storage Tips for Winter

Whether afloat or ashore, the right storage conditions make all the difference.

  • Marina storage: Double up mooring lines, fit chafe protectors, and check fenders are secure.
  • Dry stack or trailer storage: Ensure the hull is properly supported and drain plugs are removed.
  • At-home storage: Choose a breathable cover and check that air circulates freely underneath.

Whichever method you choose, inspect your boat regularly — especially after high winds or freezing weather — to catch any problems early.

Planning Winter Upgrades, Refits, or Repairs?

Winter is the perfect time to take stock and improve your boat. From upgrading electronics and sails to refitting interiors or installing greener systems like solar panels or lithium batteries — now’s your window.

If your winter plans outpace your budget, SALT can help keep things afloat.

With SALT’s flexible boat finance options, you can raise funds against your current vessel to cover repairs, refits, or eco-friendly upgrades — all without dipping into savings. Spread the cost over manageable monthly payments and sail into next season with confidence.

Talk to the SALT Crew

At SALT, we understand what your boat means to you — and the importance of caring for it responsibly. Whether you’re planning a small upgrade or a full-scale refit, our friendly crew can help you navigate the best finance options for your needs.

📞 Get in touch today to chat with the team, or get a quote HERE

Your next boating adventure begins this winter — start with the right care and a smart plan.