The principle why self-replenishing tire fluid can repair tires is this: because the self-replenishing fluid contains cowhide fiber particles, glue and other ingredients. When there is a hole in the tire, the self-hydrating cowhide fiber particles will fill the hole in the tire, and the glue will quickly stick the particles, and the difference in air pressure between the inside and outside of the tire will be used to make the cowhide fiber tightly adhere to the inner wall of the tire. On, it serves the purpose of repairing the tire.