How to Repair an Inflatable Kayak or SUP

PVC drop-stitch inflatable craft operate at pressure, and at that pressure even a small puncture creates a meaningful problem that worsens with use. A pinhole that would be trivial on a garden inflatable toy creates a meaningful stress failure in a paddle craft. The most common single cause of puncture in kayaks and SUPs is a submerged sharp object, often a rock or broken glass on a riverbank, that is invisible until the craft is over it.

Seam separation is a different failure mode. Drop-stitch PVC boards are built from two PVC skins bonded at their edges under high tension. The factory bond at that edge uses solvent-activated PVC adhesive which can degrade under sustained UV and salt exposure over time. When the seam begins to separate it does so gradually, losing a centimetre or two at a time, which shows up as slow deflation overnight rather than a rapid pressure loss on the water.

Both punctures and seam separations are repaired with Stormsure Flexible Repair Adhesive on a clean, prepared surface. The key distinction from most other adhesives used on inflatables is that Stormsure remains flexible at full inflation pressure rather than becoming rigid, which matters when the board cycles between inflated and deflated states repeatedly over a season.

What You'll Need

• Stormsure Flexible Repair Adhesive
• TUFF Tape (for emergency on-water temporary stabilisation)
• Spray bottle with soapy water, or bucket of water
• PVC patch material (from the craft's repair kit, or purchased separately)
• Isopropyl alcohol
• Sandpaper 120 grit
• Clamps or flat weights

How To Do It

1. Inflate to full pressure and locate every leak

Inflate the craft to its rated paddling pressure, then mix washing-up liquid with water in a spray bottle and spray it systematically over every surface and seam. Any leak site will produce sustained bubbles within a few seconds of spraying. Work in sections: deck, hull, each tube or rail. Mark every bubble source with a wax pencil or chalk dot before deflating, including small ones. Multiple small leaks are common on older craft and sealing one while missing two others means another deflation test the next day.

2. Deflate completely and prepare the repair area

Deflate the craft fully so the PVC lies flat and stable. Clean the repair area on the craft and the patch material with isopropyl alcohol. Allow five minutes drying time. Then roughen both surfaces (the area on the craft around the leak, and one face of the patch) with 120-grit sandpaper in a crosshatch pattern, which increases the bonding surface area significantly. Clean both roughened surfaces again with IPA and a fresh cloth to remove all sanding dust before applying adhesive.

Timing: 5 minutes drying after final IPA wipe

3. Cut the patch to the right size

Cut a PVC patch that extends at least 30mm beyond the leak in every direction. For a 10mm puncture, this means a patch of at least 70mm diameter. Round all corners. For a seam separation, cut the patch to cover at least 20mm each side of the seam centreline, with rounded corners. If the craft came with a repair kit, use the supplied patch material as it is matched to the PVC type.

4. Apply Stormsure to both surfaces

Apply a thin, even coat of Stormsure Flexible Repair Adhesive to the roughened face of the patch and to the prepared area on the craft around the leak. Work the adhesive into any surface texture using a matchstick.

5. Press the patch and apply sustained weight

Align the patch carefully over the leak site and press from the centre outward, working any air out from under the patch. Apply flat weights (books, a wooden board, filled water bottles) across the patch and leave the craft on a flat surface. Do not try to roll or fold the craft during this period as movement will peel the patch edge before the adhesive has set.

Timing: 30 minutes minimum before moving; 24 hours before inflation

6. Full cure before inflation

Leave the repair for 24 hours before inflating. Inflating too early puts the adhesive under shear stress before it has developed full cohesive strength, and the most likely failure mode is the patch peeling at the edges rather than the adhesive film itself failing. After 24 hours, inflate and retest with soapy water before returning to open water.

Timing: 24 hours full cure before inflation

Prevention Tip

After each paddle, rinse the craft with fresh water and allow it to dry before rolling or folding it for storage. PVC becomes stiff and prone to cracking when repeatedly folded along the same crease line, so vary how you roll the board each time or store it inflated on a rack if space allows. UV is the main long-term degradant of PVC: if the board lives outdoors or in a hot vehicle, a UV protectant spray applied twice a year significantly slows the surface oxidation that precedes seam degradation.

Common Questions

Can TUFF Tape handle the pressure of a fully inflated SUP on the water?

TUFF Tape can slow a pinhole leak significantly when applied to a clean, reasonably dry surface, buying time to return to shore. It is not a permanent repair and should not replace a proper rescue plan. It is not a permanent substitute for a bonded PVC patch but it will not fail mid-crossing if applied to a clean, reasonably dry surface. The practical use case is stabilising the leak on the water so you can paddle in without losing buoyancy, then making the permanent Stormsure repair at home. Keep a strip of TUFF Tape in your paddle bag specifically for this situation.

My kayak has a seam separation running about 30cm along the side tube. Is this repairable at home?

Yes. Clean the inside faces of the separated seam, apply Stormsure to both inner surfaces, press together, apply flat weights, and leave for 24 hours to cure. Then apply a PVC patch over the outside of the seam to reinforce the repair. Seam repairs done this way can be very durable. Stormsure is more flexible than many of the solvent adhesives used in manufacture, which helps it tolerate the board's inflation and deflation cycling.

Can I use Stormsure on a Hypalon inflatable?

Hypalon (chlorosulfonated polyethylene, now usually called CSM) requires a dedicated Hypalon adhesive for a reliable permanent bond. Stormsure is formulated primarily for PVC, neoprene, and similar materials. It may provide temporary adhesion on Hypalon but it is not the correct long-term solution. Check the material specification on your craft before applying any adhesive.

How do I confirm the repair is airtight before paddling?

After 24 hours cure, inflate to the full rated pressure and spray the repair site with soapy water. Leave it for five to ten minutes and watch for any bubbles forming at the patch edge or over the repaired area. A properly cured Stormsure repair on a correctly prepared PVC surface is consistently airtight. If a small bubble appears at the patch edge, apply a thin bead of Stormsure around the perimeter of the patch, allow it to cure, and retest.