The aerosol did its job, and that is the problem. Tyre sealant was designed for one thing, a small clean puncture in the tread area, held in the tyre while the wheel turns and the liquid finds the hole. Fired into a tyre with a cut in it, it does something else entirely. It coats the whole inner liner in a film of latex, seals nothing that matters, and buries the evidence.
The verdict on a cut is reached by looking at what the blade actually reached. Has it opened the inner liner. Are there cords showing in the base of the groove. Is the belt edge exposed anywhere along it. All of those are read from inside the casing, and all of them are invisible under a coating that has to be scraped and washed off before anyone can say anything honest. It gums up a TPMS sensor into the bargain, which is a separate problem nobody expects.
The damage does not care where the car is parked, and neither does the fix. A driveway in Thornton Heath, a work car park, a kerbside bay: the van brings the tyre, the jack and the balancer to all three. Old tyres leave Pollards Hill, Norbury and SW16 with us, every time. You watch it happen in Thornton Heath, or at the kerb in Green Lane.
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Debris in the gutters along the A23 through Norbury makes cuts a routine job here rather than an unusual one, and a fair few arrive with a canister already emptied into them. We would rather see the tyre before that happens. Where it has, the liner gets cleaned out first and the call is made on what is actually in front of us.
A cut picked up off the A23 had been dosed with sealant at the roadside and had held pressure for a day. Off the rim, the cut ran into the shoulder and cords were visible in it. Nothing was ever going to seal that. It was just slow enough to look as though something had.
Where sealant has been used and the tyre might genuinely be saveable, the liner gets cleaned back to bare rubber first. Only then does the damage get measured. A patch bonded on top of sealant residue is not bonded to anything.
A screw in the central tread, sealant used, tyre still holding. It was cleaned out, reamed, plugged and patched properly from the inside, rebalanced and refitted. The sealant was never the fix. It was the thing that kept the car moving until a fix was possible.
Use it if you are somewhere you should not be standing about, such as the gutter of London Road with buses coming past. Just treat it as a way of moving the car rather than a repair, and tell us you have used it.
Not by itself. It makes more work, because the liner has to be washed back to clean rubber before a patch will bond, and it can foul the valve and the sensor. The damage still decides the outcome.
A nail leaves a round hole with the shank still sitting in it more often than not. A cut is a slit whose edges open when you flex the rubber, and it usually runs across tread blocks rather than into one.
It is a different one with the same ending. Perishing is age and sunlight hardening the rubber from the surface inward, it cannot be reversed, and a wall that has begun to craze is finished.
That is normally how it goes. We come out, take the wheel off, look the tyre over with you and give a straight answer. Plenty of these end with the same tyre going back on the car.
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