How to Shrink Wrap a Boat: Storage and Transport Covers

Shrink wrap is the most effective cover for a boat in winter storage or road transport. Unlike a tarpaulin held down with ropes and straps, a shrink wrap cover is heat-shrunk drum tight to the boat's profile — no movement, no flapping, no chafing against gelcoat or paintwork.

This guide covers the full process for wrapping a yacht or motor boat: preparation, support structure, covering, welding, shrinking, venting and finishing. It is written for marinas, boatyards and boat owners carrying out the work themselves.

If you would prefer to have a professional team carry out the wrapping, contact us to discuss your requirements.

When to Shrink Wrap a Boat

The two main applications are winter storage and road transport.

Winter storage covers protect the boat from rain, snow, UV exposure and wind damage while it sits ashore or on a mooring for an extended period. A well-installed cover allows air to circulate via purpose-fitted vents while keeping the interior fully dry.

Transport covers are applied before a boat is moved by road — either from factory to dealer, dealer to customer, or for general road transport. A transport cover must hold securely at motorway speeds without movement or chafing. The heat-shrunk, drum-tight fit of shrink wrap makes it significantly more reliable than tarpaulins and ratchet straps for this application.

Materials

Shrink Wrap Film

Marine shrink wrap film is manufactured from LDPE, low density polythene, with additives for long outdoor service life and UV resistance. For boat storage and transport, the appropriate thickness is 200-250 micron. This is lighter than the 300 micron film used for scaffold encapsulation — the loads are different and the lighter film shrinks more easily over the compound curves of a boat hull.

• 200 micron (8 mil) — suited to boats being stored in a sheltered yard or marina where exposure is moderate.
• 250 micron (10 mil) — the better choice for boats stored in exposed locations or being transported by road, where greater durability is needed.

Standard grade film is suitable for most marine applications. Film is available in a range of widths — wide rolls reduce the number of joins needed across the boat's length. Allow approximately 10% extra per roll for wastage from overlaps, pleats and offcuts.

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For more detail, read our Shrink Wrap Film Buying Guide.

Heat Gun

The propane gas heat tool is the essential piece of equipment for all shrink wrapping. It is used to weld the film and heat shrink the cover drum tight. The gun must have a dead man's trigger — it stops immediately if dropped or released. It connects to a propane cylinder via a hose and regulator.

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For more detail, read our Heat Gun Buying Guide.

Strapping (Perimeter Band & Support)

A woven polypropylene or polyester strap runs around the hull at the waterline and provides the anchor point for the cover. This perimeter band is the foundation of the wrapping system — the lower edge of the film is folded under and around it, distributing load around the hull. Additional belly bands running under the hull can be used on wider boats or where extra security is needed.

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Patch Tape

100mm wide patch tape is used for repairs, finishing details and to reinforce the lower edge seal along the hull perimeter. This is the area most exposed to wind and water entry. Use a tape with a synthetic rubber adhesive and UV inhibitor. Cut tape with a knife rather than tearing it — a clean edge adheres better and blends into the white film.

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For more detail, read our Shrink Wrap Tape Buying Guide.

Boat Vents

Purpose-made self-adhesive ventilation vents are installed in the finished cover to allow air to circulate beneath it. A completely sealed cover traps moisture and creates ideal conditions for mildew growth inside the boat. Vents are essential on all storage covers — they are not optional. A minimum of two vents is required; more is better on larger boats or in humid climates.

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Support Frame — Timber Uprights and Webbing

The support frame is most commonly built using timber uprights with 19mm woven webbing strung between them to form the ridge and lateral support runs. The timber uprights are positioned at intervals along the centreline of the boat and padded at every contact point with the boat. 19mm webbing is the same strap used for the perimeter band. A full timber frame is an alternative used for larger boats on refit or boats with straight-sided profiles where a more rigid structure is needed.

Welding Gauntlets and Sleeve

Leather welding gauntlets are required for all hot works — the film gets hot during welding and the gauntlets are used to press sheets together immediately after heat application. A leather welding sleeve provides additional protection to the upper arm.

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Preparation

Clean and dry the boat

Clean the hull, deck and topsides thoroughly before wrapping. Dirt, salt and grime trapped under shrink wrap during a winter storage period can cause staining, corrosion and mildew. The boat should be as dry as possible before the cover goes on — a wet interior sealed under a cover is a mildew problem waiting to happen.

Remove or protect sharp edges and fittings

Shrink wrap film is tough but not impervious. Sharp edges — cleats with exposed bolts, pushpit fittings, aerials, davits — will wear through the cover over time if in direct contact. Pad any protrusion that cannot be removed with foam pipe lagging, cloth padding or similar. Cap exposed tube ends.

Remove anything that does not need to be on the boat during storage — canvas covers, cockpit cushions, removable aerials and fittings. The cleaner and simpler the boat's profile, the easier and more effective the cover will be.

Seal hull vents and fuel vents

Fuel vents that will be covered by the wrap should be sealed with tape or plugged temporarily — they will be pushed through the cover later once the wrap is in place. Engine and hull vents are handled the same way. Gas bottles stored on board should be turned off.

The Support Frame

A support frame is built over the boat before the film is applied. The frame creates a ridge along the centreline of the boat — similar to a tent ridge pole — which gives the finished cover a pitched profile so that rainwater and snow run off rather than pooling on the deck.

The most common approach uses timber uprights to support a run of 19mm woven webbing. The uprights are positioned at regular intervals along the centreline of the boat — typically at the bow, stern, mast position and at intervals along the coachroof and cockpit — and the webbing is strung between them from bow to stern to create the ridge line. Additional webbing runs can be added laterally if needed to support the film across wider sections of the boat. Every contact point between the timber uprights and the boat must be padded to prevent marking or damage to the deck and coachroof.

The frame height should be sufficient to create a meaningful pitch — a minimum of 300mm above the highest point of the boat gives enough slope for effective water runoff.

A full timber frame — where the entire structure is built from timber rather than webbing — is the alternative approach, but it is typically reserved for larger boats undergoing winter refit where a more substantial working frame is required, or for boats with straight-sided profiles such as motor cruisers where a more rigid structure is needed. For the majority of storage covers on yachts and motor boats, the timber upright and webbing method is faster, lighter and equally effective.

The Perimeter Band

The perimeter band is a strap — typically woven polypropylene — that runs around the hull at the waterline or just above it, all the way around the boat. The lower edge of the shrink wrap cover is folded under and around this strap, giving the film a fixed anchor point that distributes the load around the hull.

Additional belly bands — straps running under the hull from one side to the other — can be used on wider boats or where additional security is required. Belly bands are typically positioned every metre to metre and a half along the hull length.

Covering the Boat

With the frame in place and the perimeter band fitted, the film is drawn over the boat.

For a typical yacht or motor boat, the roll is positioned at one end of the boat at ground level on a roll stand, and the film is drawn lengthways over the frame. Pulling the film onto the boat as a narrow strip with the folds taped closed is easier than trying to control an open sheet — once the film is in position over the frame, the tape is cut and the film unfolded outward to cover the sides.

The film is pulled down on each side to the perimeter band and folded under and around the strap. Clip or tape temporarily to hold the edge in position before heat welding. The lower edge of the film should extend past the perimeter band by enough to create a secure fold and seal — typically 30-40cm.

At the bow and stern, the film will need to be pleated to take up the taper. Pull the film flat at each pleat, tape in position, and heat weld the pleat flat. On boats with a significant sheer or complex profile, more pleating will be required — this is where experience makes a difference.

Welding and Sealing

The film is heat welded along all joints — where the film overlaps itself at pleats, at any longitudinal seams if more than one sheet width is needed, and at the lower edge where the film wraps under the perimeter band.

Welding technique for boat wrapping follows the same principles as for scaffold shrink wrap: direct hot air between the two layers to bring both to melt point, then press together with the gloved hand and immediately direct heat from the outside to consolidate. Work consistently along the full length of the joint.

The lower edge seal — where the film meets the perimeter band — needs to be secure and weatherproof. Use patch tape along the full length of this junction on both sides to reinforce the seal. This is the area most exposed to wind and water entry.

Shrinking

Shrinking a boat cover follows the same technique as any shrink wrap application — hold the heat gun 30-40cm from the surface and work across the film in consistent passes, like spray painting.

Start at the bottom of one end of the boat and work upward toward the ridge, then along and down the other side. Starting at the bottom allows the heat to rise and helps the film shrink progressively upward. Do not start in the middle of a large panel — this traps creases and makes them harder to remove.

Work systematically — complete one area before moving on. Do not go back over already-shrunk areas. Use less heat near welds, where the film has already been heated.

On a boat with a complex profile, some areas will pull tight as adjacent panels are shrunk — check periodically that the overall tension is even and that no single area is being over-stressed.

Ventilation

All storage covers must be vented. A completely sealed cover traps moisture and creates ideal conditions for mildew growth inside the boat. Ventilation patches — purpose-made self-adhesive vents — are installed in the finished cover after shrinking.

Position vents at both ends of the boat, fore and aft, and on both sides where possible to create cross-ventilation. Cut a hole through the cover, clean the area around it, and apply the vent patch firmly. A minimum of two vents is required; more is better on larger boats or in humid climates.

Fuel vents and hull vents that were sealed during preparation should be pushed through the cover from the inside once the main cover is complete and the vent holes have been cut.

Finishing and Inspection

Walk around the completed cover and check:

• Is the film tight and drum-like across the full surface? Loose areas will flap in wind and eventually fail. Spot-shrink any areas that are not fully taut.
• Are all pleats fully welded and flat? A pleat that has not been fully bonded can open in strong wind.
• Is the lower edge fully sealed along the hull? Check the full perimeter — any gap at the waterline is a water entry point.
• Are the vents correctly installed and the vent holes clean?
• Are there any holes or thin patches from shrinking? Patch with tape immediately.

A correctly finished boat cover should sound like a drum when tapped, show no visible wrinkles or loose areas, and have all vents correctly fitted and the lower edge fully sealed.