Tech Permacure is a heavy duty puncture repair material that can be easily inserted from the outside of the tire. Vulcanized with a specialized chemical cement that integrates with the tires, allowing it to penetrate into cracks inside the tire for heavy duty repairs. TECH is a manufacturer and distributor tire repair products worldwide, and Permacure products have been reliable and proven by their respective tire manufacturers subsidiaries. Permacure is a very popular product because it can repair punctures without removing tires from the wheels.