Dynaplug repair plugs fuse with the tire without any glue or solvents. This is achieved by using a proprietary viscoelastic rubber impregnated cord. Using viscous rubber allows the plug to conform to the shape of of the puncture and fills fissures in the puncture path. These plugs will never dry out or become brittle like most repairs plugs/patches and will last the life of your tire for a permanent repair.