Tyreweld is a puncture repair which contains a water-based foam that acts as a car tyre sealant. It re-inflates the tyre and when you drive the foam finds the puncture and seals it, so you can drive to a garage for a full repair. This compact puncture repair kit is much smaller and lighter than a spare tyre which also saves space and fuel. Tyreweld emergency tyre repair is easy to use, thanks to a unique twist and go mechanism. Just attach it to the tyre valve then watch as it quickly refills the tyre. Always read the instructions.