Punctures are usually caused by foreign objects damaging the tyre. If they occur within the tread area of the tyre, Protex will repair the tyre instantly and permanently. When the tyre rolls, the sealant is spread uniformly on the inside surface of the tyre. If a nail punctures the tyre, then it pierces through the tread to this inside surface. The air pressure forces the sealant to close the opening. Thus, the tyre opening is sealed within a couple of rotations of the tyre and the driver is unaware of the incident. When the nail is inspected and removed, the sealant is capable of sealing the tyre again, usually without any loss of pressure. Simply remove the object and drive the vehicle.