Fibres constitute the backbone of the tyre sealant. The stronger the fibres, the stronger the tyre repair. The strongest fibres are state-of-the-art synthetic fibres such as those used in tyre cord and bullet proof vests. Using a variety of fibres is also very important, especially in the relatively thin carcass of an ATV, golf buggy or lawn care equipment tyre. The more varied the fibres in both length and degree of branching, the faster the seal forms and the more permanent the seal is.