A can of sealant works by spraying a latex slurry into the tyre and letting the wheel fling it about until some of it lands in the hole. It does land in the hole. It also lands everywhere else. The entire inner surface of the casing ends up coated, so the one thing a repairer has to examine is now hidden under a skin of glue, and no patch will bond to a liner in that state until every trace has been scraped and cleaned away.
Most kits will fill the pressure sensor on the end of the valve as well, and a sensor full of latex is generally a sensor you buy again. A can grabbed at a petrol station can therefore turn a nail hole into a new tyre and a new sensor. Ring instead, whatever the hour. The wheel comes off, the casing is inspected from the inside, the hole is reamed out, a plug and patch goes in as one piece, patched to BS AU 159 from behind, and the wheel is rebalanced before it goes back. That sequence works at two in the morning exactly as well as it works at two in the afternoon.
An overnight repair follows exactly the same standard as a daytime one, and it is worth being clear about that. Where the damage falls outside the standard you get told at that hour and a replacement goes on from the van, on the drive in Lower Sydenham or wherever the car is. Level in Sydenham, sloping in Crystal Palace: we set the car straight first. Underground parking in Crystal Palace or Bell Green is worth flagging. SE26 takes in Bell Green and Forest Hill, and we work the lot.
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A tyre going down at night here leaves you two poor options: kneel in the road on a gradient with the jack that came with the car, or drive on it and hope. The climbs between Forest Hill and Crystal Palace are precisely where a soft tyre gets hot and unseats itself from the rim, and the streets are too steep and too tightly parked for a wheel change to be a sensible thing to attempt on your own.
Used at the roadside one evening and still going down by morning. By the time the tyre was opened up, the liner was coated, the sensor was clogged and a repairable nail hole had become a replacement.
A tyre losing air on a steep road with nowhere sensible to swap a wheel in the dark. We came to the car rather than have anybody jack it on that gradient, and it was finished before the first buses ran.
Modern cars often carry a can and a small compressor where a wheel used to live. That is fine until the puncture is one a can cannot hold, which is most of the ones worth worrying about.
Not automatically. If the hole is in the tread and the tyre has not been run flat, the liner gets cleaned back to bare rubber and repaired properly. Using a can adds time rather than ruling a repair out. The sensor is the part more often lost.
As a way of reaching somewhere safe, yes. As a repair, no. Treat it as a means of getting off a bad stretch of road, tell whoever opens the tyre that you have used one, and expect it to have cost you the sensor.
Yes, every night of the year. A tyre with a nail in it is repairable at one in the morning and often is not by eight, because what ruins a casing is the drive you make on it at breakfast, not the nail itself.
Because the tyre has been off the rim and will not sit back in precisely the same position, and a patch carries weight of its own. A wheel a few grams out shakes the steering at speed. Balancing is part of the repair, not an addition to it.
Yes. The work happens with the tyre off the rim, and keeping the bonding area dry and clean is a matter of how you set up rather than what the sky is doing. What will not happen is the cleaning stage being hurried because it is wet.
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