Mr. Wang Xueyong from the Engineering Department of Michelin China Product Department: "There are many kinds of tire repair methods on the market. There are glue strips, heat-filling, and patch-filling. It is rare to see mushroom nails. The repair method, for Michelin, is more in favor of the repair of mushroom nails. If there is no mushroom nail repair, we recommend the method of using the internal subsidy film. If we only use rubber strips or hot fill, we do not agree. May cause a variety of tire problems."

■Mushroom nails are plug and piece joint repair materials. The comprehensive repair mode of plug and paste is convenient and quick, natural cold vulcanization, high temperature resistance, no degumming, and excellent tire repair effect. Must be used when the angle of the injured hole is less than 26 degrees.

■ Mushroom nail repair is the most advanced method of filling vacuum tires in the world. Aircraft tires also use this method of supplementation.

The principle, the steps and the internal patch are the same, except that it is not attached to the film, but a rubber nail that looks like a mushroom, so it is called a mushroom nail. Put the "root" of the mushroom nail out of the damaged part of the tire, and then cut off the excess that leaks outside, and the "head" inside is glued with a strong glue. Since the damaged part is completely blocked, the water is prevented from immersing in the damaged portion and damaging the tire wire and the ply, so it is the safest and most reliable method of tire repair.