A can of tyre sealant does not repair anything. It floods the casing with latex slurry and, where air is escaping, the slurry gets dragged into the gap and sets there. The leak stops. The screw is still in the tread, the belt around it is still torn, and the inner surface is now under a film that hides the damage from anyone who opens the tyre later.
That is the sequence behind a surprising number of the blowouts we attend. Sealed with a can, driven for a fortnight, then the tyre lets go at speed on the A20 Sidcup Road with no warning at all. Heat finishes it. A damaged belt works against itself on every revolution, the rubber around it softens, and at speed the separation runs until the casing opens.
The noise arrives before the steering does. Hold the wheel, come off the throttle without braking hard, and let the car slow itself before you steer for the verge. Then call. Common car, SUV and 4x4 sizes travel with us and the tyre goes on where the car stopped.
People ask whether we can really fit a tyre at the roadside. So a burst tyre on Eltham High Street or on a hard shoulder gets the same job as one on a driveway: off, on, balanced, pressures set. A Well Hall cul-de-sac or an Avery Hill main road, tell us which. A tight terrace in Avery Hill or a narrow bay on Sidcup Road is usually workable. The SE9 postcode and a street in Avery Hill: that is enough.
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Most of SE9 funnels onto the same fast stretch, so a tyre quietly failing for a fortnight tends to choose that road to give up on. There is nowhere generous to stop and no safe way to change a wheel beside live traffic. Get the car into one of the residential turnings behind Well Hall Road first, then call.
A front tyre in pieces on a car near Well Hall Road. Once the casing was opened the inside was glazed with dried latex and a roofing nail still stood in the tread, right where the separation had begun. It had been sealed months earlier and forgotten.
A tyre let go at speed on the A20 Sidcup Road. The driver held the wheel steady and let the speed fall away rather than braking, which is why nothing worse happened. The casing had torn from the shoulder inward and there was nothing left to assess.
A driver near Eltham High Street had emptied a second canister into the same tyre after the first stopped holding. The sensor was full and the liner unreadable. That tyre had been finished for some while and was only waiting for the right stretch of road.
Possibly, if the object had gone through the middle of the tread and the tyre had not been driven soft. What removes the option is less the latex than the weeks of running afterwards on a belt already torn. Sealant buys distance, and distance is what the injury needed least.
It has one use, which is moving a car off a fast road under its own power when staying put would be worse. It is not a repair. If you have used a can, say so when you ring, because it changes what we bring and how long the work takes.
No. A burst is the structure coming apart rather than a hole through it, and nothing sound is left for a patch to hold on to. Anybody offering to save one is offering something that cannot be done.
Worth doing while the wheel is off, and it takes a couple of minutes. Debris arrives in company, and the tyre that failed has usually done the same miles at the same pressures as the one beside it. We check depth, pressure and both walls.
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