A proper puncture repair is two jobs in one piece of rubber. The stem fills the hole through the casing so water cannot creep down to the steel belts and rust them. The patch bonds flat to the inner liner and takes the constant flexing, and that is the part actually holding the air. A mushroom plug does both at once. It is pulled through from the inside, so the head lies under the liner and the pressure in the tyre presses it harder onto the hole. Anything pushed in from the outside works the opposite way round.
So we do not carry string plugs and will not sell you an aerosol as a fix. Neither lets anyone see the inside of the tyre, and the inside is where the answer lives. A nail that looks innocent can have cut a belt on its way in. A tyre driven two miles soft is scrubbed to powder on the liner while the outside looks untouched. The tyre comes off the rim, gets read under a lamp, and gets repaired to BS AU 159 or not at all. Where the hole sits settles it: central tread yes, shoulder or sidewall no.
An emergency repair should end with a legal car, not a temporary one. We do that at the car in Littleton, fit a proper internal plug-patch to British Standard where it qualifies, rebalance and set the pressure. The B375, the M3 and the streets around Littleton sit inside Surrey. We jack on Upper Halliford tarmac, Lower Halliford block paving and the surface on the M3 near junction 1. Tight in Lower Halliford, easy in Littleton: neither stops the job.

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There is no spare hour in a school morning. From Lower Halliford or Charlton you would be looking at a run to a fitting bay, a wait for a slot and a run back, and that is before the A244 has had its say about your timings. The car is on the drive and so are we, so the repair happens there and the rest of the morning carries on as planned.
The car is loaded, the tyre is down and there is a school gate closing in forty minutes. We take the wheel off, do the repair properly on the drive and put it back, rather than pumping it up and hoping.
A previous quick fix held for a fortnight then started weeping again. Once the tyre was off, the wound inside had never been closed and the belt ends were already rusty. That one had to be a replacement.
Found before the drive rather than during it, which is the good version. A nail sitting square in the middle of the tread is about the most repairable thing a tyre can pick up.
In the middle of the tread, done to the standard, yes. It is a permanent fix and the tyre keeps its speed rating. What it is not is a licence to ignore a second nail two inches away, because repairs need separating.
Because the sidewall does all the bending. It flexes thousands of times a mile, and no patch stays bonded through that. A repair there fails without warning at speed, which is why the standard forbids it rather than leaving it to opinion.
Please do not. A tyre run flat destroys itself from the inside in a couple of miles, and a repairable puncture turns into a new tyre for no reason. Park it, leave it, and let us come to where it stopped.
More than one is possible if they are far enough apart and all in the repairable zone, but there is a limit and we will tell you when a casing has had enough. Two patches close together is a replacement, not a repair.
Every time. A puncture cannot be judged with the tyre still on the rim, let alone repaired properly. Anything that claims otherwise is a bodge, and the giveaway is that nobody ever looked at the inside.
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