Plenty of the tyres we take off in the small hours have nothing in them at all. No nail, no screw, nothing through the tread. The air is escaping where the bead sits against the rim. Alloys corrode under the lacquer, salt and road grit work into the chip a kerb made, and the white powdery oxide that grows there lifts the tyre off its seat by a fraction of a millimetre. That is enough. A pound or two of pressure a day, worse in cold weather, and not a mark on the tread to explain any of it.
Nothing done from the outside touches that fault, which is why the can of foam did nothing and a plug would be pointless. The tyre has to come off the rim so the flange can be cleaned back to bright metal, the seat sealed properly, then the tyre reseated and the wheel rebalanced. It is not a long job once the wheel is off the car, and it holds for years. Doing it at three in the morning is not heroics. It is that the car is standing still and nobody needs it.
The night before an MOT is a popular time to find a puncture. We come out at that hour to Old Shepperton or wherever the car is parked, take the wheel off, inspect the casing from the inside and fit a proper internal plug-patch where the damage permits. Underground parking in Littleton or Charlton is worth flagging. An Upper Halliford cul-de-sac or a Lower Halliford main road, tell us which.

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These arrive with the cold. Cars sit out overnight all round Shepperton Green and Upper Halliford, the grit thrown up off the A308 finds every chip in a wheel, and a tyre that behaved itself in the autumn is soft by the end of winter. The wheel has to come off either way. It may as well come off on your own drive at an hour that suits you than in a queue behind three other cars.
Pressure that drops steadily rather than suddenly points at the rim, not the tread. We come to the car, get the tyre off and clean the seat instead of sending you back to the forecourt airline every few days.
A driver who has been over the tyre twice with a torch and found nothing is usually right. The leak is on the inside face of the wheel where you cannot see it, and it needs the tyre off to reach.
One knock against a kerb in Upper Halliford breaks the finish, and the salt does the rest over a winter. We clean the corrosion off, seal the seat and put the same tyre back on the same wheel.
Two things at once. Air in the tyre contracts as the temperature drops, so a pressure that was borderline reads low, and cold rubber is stiffer and sits less willingly against a rough seat. Warm weather can hide the same fault for months.
No, and it makes the real repair messier. Sealant is designed to bridge a small hole in the tread. Sprayed round a leaking bead it coats the inside of the tyre, gets flung about when the wheel spins and has to be washed out before anything proper can be done.
Almost never. Corrosion sits on the surface of the seat and comes back to clean metal with the right tools. A wheel is only finished if it is cracked or badly buckled, and that is a different conversation from a leak.
Not if the seat was properly cleaned rather than smeared over. What brings it back is doing it in a hurry and leaving corrosion under the sealer, which is exactly the outcome the cheap version of this job produces.
It does not. What we quote you on the phone is what you pay, and the clock has no say in it. You agree the figure before anybody touches the car, night or day.
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