Knowledge hub · owners
Repairs, patching and adhesives in the heat
Most small leaks are a twenty-minute job if you do them properly, and a permanent problem if you do not. This is how we do them, including what changes when you are working in tropical heat and humidity.
Check the valve before you reach for glue
A boat that is soft in the morning has usually not been punctured. Sand or salt under a valve core, a core that has backed off a quarter turn, or a valve cap left loose will lose air quietly all night. Take the valve key, seat the core firmly, rinse the housing with fresh water and test again before you assume the worst.
Remember also that pressure moves with temperature. A hull inflated on a cool morning reads lower after a cold night and higher in the afternoon sun. That is physics, not a leak — and it is exactly why every Aerowave chamber has an over-pressure relief valve fitted as standard.
Patching a PVC hull, step by step
- 01
Check the valves first
With the chamber at working pressure, listen close to each cap for a hiss. A leaking valve is usually a pin sitting slightly off its seat: press it down, give it a small turn and let it spring back up. Keep water off the valves. Then soapy water on the seams and hull only, and mark the spot with a pencil, not a marker pen — solvent will smear ink into the repair area.
- 02
Cut a round patch
Round or oval only. Corners peel. Allow at least 30 mm of overlap in every direction beyond the damage.
- 03
Clean and key both surfaces
Use the cleaner supplied with the adhesive system. Let the solvent flash off completely — a surface that still smells wet is still wet.
- 04
Mix small, work cool
Two-part adhesive, mixed to the stated ratio, in batches you can use inside the working time. In heat, that window is much shorter than the tin suggests.
- 05
Two thin coats, not one thick one
Coat both patch and hull, let each coat go touch-dry, then place accurately the first time. There is no repositioning.
- 06
Roll it out and leave it alone
Work from the centre outwards with a seam roller to drive air out, then leave it unloaded for the full cure time before pressurising.
Working in heat and humidity
We get a lot of questions about this from owners in the tropics and across South-East Asia, and the honest answer is that the adhesive, not the fabric, is the limiting factor.
Work early, work shaded
Surface temperature matters more than air temperature. A dark tube in the sun can be well above 50°C, which will skin adhesive in under a minute.
Beat the humidity
Moisture on the surface stops the bond keying. Dry thoroughly, then clean with the system's own cleaner and let it flash off before coating.
Mix less than you think
Two-part adhesive that has started to thicken is finished. Small batches, used immediately, beat one big mix every time.
Allow longer cure, not shorter
Heat speeds the skin, not the full cure. Leave the patch unloaded for the full manufacturer's schedule before you pressurise the chamber.
Always follow the instructions supplied with your adhesive system — cure schedules and temperature limits vary between products, and the manufacturer's figures beat any general advice, including ours.
Straight answers
- How do I find a slow leak in an inflatable boat?
- Inflate to working pressure and check the valves first, without any water on them: listen close to each cap for a hiss and note any chamber that has softened. If a valve is leaking, press the centre pin down, give it a small turn and let it spring back up — that re-seats the pin, and it is by far the most common cause of a boat that goes soft overnight. Only once the valves are sound should you brush a mix of water and a little dish soap over the seams and the underside to find a hull leak; fine, persistent bubbles mark it. Never put soapy water on or around a valve or its cap — moisture works into the surrounding fabric and bond line.
- What glue should I use on a PVC inflatable?
- A two-part PVC adhesive designed for inflatable boats, used with the correct cleaner or primer. Single-part contact adhesives are for temporary field repairs only. Never use household or hardware-store contact cement on a hull — it will not survive heat and UV, and it contaminates the area for a proper repair later.
- Why do repairs fail in hot, humid climates?
- Two-part PVC adhesives cure by chemical reaction and are sensitive to both temperature and moisture. Above roughly 30°C the working time collapses, so the glue skins before the panels are placed. High humidity can leave a haze on the surface that stops the bond keying. Work early in the morning or in shade, keep the surfaces genuinely dry, and mix small batches.
- How long should I leave a patch before using the boat?
- Follow the adhesive manufacturer's cure schedule — most two-part PVC systems want the patch left unloaded for at least 24 hours, and full strength can take longer in cool or damp conditions. Do not inflate to full working pressure early to 'test' it.
- When should I stop and call a repairer?
- Anything on a seam, anything longer than about 50 mm, anything through a reinforcement patch or around a fitting, and anything on the underside of the keel. Those are structural and need a proper shop repair. A field patch on a structural failure is for getting home, nothing more.
- Can Easy Inflatables supply parts?
- Yes. We hold replacement parts in both Australia and our Hong Kong hub, including valves, valve keys, patches and fittings, sent by DHL Express to your door. Send us a photo of the part and we will identify it for you.