It hardly matters how skilled you are or how long you've been at it - servicing truck tires, that is. You will find a big fat nail in the tread of a tire and repair it correctly in exactly the way you've been taught. And then, possibly the very next morning, that tire will be flat again. You did everything according to proper procedure and you know it. You reamed out the injury with a carbide cutter in good condition; you installed the right rubber stem; you buffed the repair area to an RMA 1 or RMA 2 surface; you removed the buffing dust; you used uncontaminated cement, which you allowed to dry until tacky; you stitched the repair unit firmly from the center outward; you did all that and more to make sure there would be no more problems with that injury. You even gave the whole tire the once-over when you were finished, looking for a second injury just in case. But still that tire goes squishy if not flat within a day or two. You have been booby-trapped. If you know a tire tech that never experiences this, have him buy your lottery tickets.
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