Will a sealant make my punctured tyre safe?

Post-puncture sealants are purely as a “get you home” measure following a puncture. Many car manufacturers now supply a tyre sealant and an inflator pack instead of a spare wheel. The sealant and compressed air are injected through the tyre valve, but the result achieved will depend on the cause of the puncture and how far and fast you have driven since the damage coccured.

It is important to check whether your car contains a puncture repair kit instead of a spare tyre and to familiarise yourself with how the sealant works should you experience a puncture. Note that there are two basic types of sealant, those that are put into the tyre in case of a puncture and those that are put in following damage to the tyre.

Pre-puncture sealants

These are injected through the tyre valve as a preventative measure. The aim is to prevent air loss if a puncture does occur so you can drive on without interruption.

If the sealant works then the seal will be pretty much instantaneous after the tyre has been punctured. This raises the concern that you will have no idea that the puncture has occurred. A large screw or nail in the tread of the tyre will cause further damage over time and could lead to a more catastrophic failure.

Post-puncture sealants

These are used following a puncture. You inject the sealant through the tyre valve and then use the compressor or a cylinder of compressed gas to re-inflate the tyre.

Keeping a can of tyre sealant in the car can bring peace of mind but it is important that you spot the puncture early and stop quickly. Driving on a tyre with a partially or fully deflated condition will cause weakening of its structure and irreparable damage.

Are sealants considered a permanent repair?

British Standard BS AU 159 states that tyres should be removed from their rims to be thoroughly inspected to ascertain their suitability for repair. It also defines appropriate repair materials. The use of a liquid tyre puncture sealant does not meet these criteria and therefore cannot be considered suitable as a permanent repair.

Permanent repair following a temporary repair

Following any temporary puncture repair, etyres will be able to ascertain whether a permanent repair is feasible in line with British Standard BS AU 159. Our mobile puncture repair service is invaluable for drivers who have made a temporary repair to a puncture. We are able to travel to your home or place of work to complete a permanent repair.

It is worth noting that around 60% of puncture repairs booked with etyres are repairable. For advice and assistance, please call our National Sales Team on 0800 028 9000.