A tyre patch is not glued on. It is vulcanised, which means the cement softens the surface of the inner liner and the surface of the patch and lets the two rubbers cure into one piece. That only happens if the cement is touching bare rubber that has been buffed clean, and nothing else in the process matters if that is wrong.
A can of sealant holds a latex emulsion, and it does not sit politely over the hole. The spinning wheel smears it around the whole inside of the tyre in a thin, even film, so by the time the wheel comes off there is a layer of it across every part the patch needs to reach. Cement on top of that bonds the patch to the sealant, and the sealant is bonded to nothing.
It is recoverable. The liner gets scraped and washed back to bare rubber, dried, then buffed and cemented as normal. That turns a half hour job into rather longer. Say on the phone if a can has been used, because it changes what we bring and how long we set aside.
DVSA-compliant is not marketing language, it is a description of the method. We do it that way every time, at the car anywhere in SE15, and where the damage falls outside what the standard allows we say so and fit a replacement instead. Nothing is towed out of Nunhead or Bellenden; the work finishes there. Pressures set before we leave Nunhead, and the same on Queens Road. A SE15 address in Bellenden and one in Queens Road are the same round.

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Plenty of the cars parked around Rye Lane have no spare wheel at all, only a canister and a compressor in the boot well, so this comes up here more than it used to. The saving grace is that most of them go down within walking distance of home. Ring first and the tyre usually comes back clean.
A driver had emptied a canister into a rear tyre and driven a couple of miles. The nail sat squarely in the central tread and the tyre was perfectly repairable underneath. Washing the liner out took longer than the repair.
On a car near Nunhead the sealant had set around the pressure sensor inside the wheel and blocked its port. The puncture was straightforward and the tyre was fine. The warning light was a separate conversation and a dearer one.
One tyre had been sealed twice over several months. The liner had a rubbery skin that came away in sheets rather than washing off, and the surface under it had begun to break up. That one was replaced.
It has one real job, moving a car out of somewhere it should not be sitting. Used there it earns its place. Used on a driveway because it seems easier than making a call, it costs you an hour of cleaning and sometimes a sensor.
Not from outside, which is why we ask. A tyre that has had a can through it usually shows residue around the valve and a slight imbalance, and both appear only once the wheel is off. Saying so on the phone saves the surprise.
No. Water and a scraper on the inner liner do nothing to the casing, and the liner is a rubber skin rather than a structural layer. What weakens a tyre is being driven on soft, which is usually why the can came out.
The repair itself is about half an hour. Bead broken, tyre off the rim, inside inspected, hole reamed square, a plug and patch bonded from within to BS AU 159 and the wheel rebalanced. Cleaning a sealed tyre first adds twenty minutes or so.
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