In an effort to save space and reduce car weight, many manufacturers have replaced the traditional spare wheel with a puncture repair kit. While these kits are compact and easy to store, they can seem daunting if you’ve never had to use one before. The good news is that they are designed to get you back on the road quickly, without needing to visit a tyre repair shop, just as a regular spare tyre would. So, let’s look at how to fix a punctured tyre using the different types of puncture repair kits commonly supplied with cars.

How to fix a tyre puncture using a repair kit

Punctures of around 4-6mm in the tyre’s tread area can be fixed with a repair kit

A puncture repair kit can only fix certain types of tyre damage. It is suitable for punctures that are 4mm to 6mm wide, which is about the size of a regular pencil tip. The puncture must also be located in the tread area of the tyre. If the damage is a long cut, a large tear, or a complete blowout, the tyre cannot be repaired and must be replaced. Similarly, punctures in the sidewall cannot be safely repaired with a puncture kit, as the sidewalls flex continuously and lack strong reinforcement. 

After confirming that the puncture is no larger than 6mm in diameter and is in the tread area, you can begin the repair. Before you start, park your car safely on the shoulder of the road, switch on the hazard lights, and place a warning triangle behind your vehicle to alert other drivers. Once these safety precautions are in place, you are ready to repair the puncture.

Type 1: Tyre sealant and inflator kit

A tyre sealant and inflator kit is the most common type of puncture repair kit offered by manufacturers such as Tata, Maruti Suzuki, MG, and Mahindra. The kit includes a tyre inflator and a bottle of liquid sealant.

To use it, insert the sealant bottle into the inflator via the dedicated slot. Then connect the inflator to the valve of the punctured tyre. Do not remove the nail or screw that caused the puncture, as doing so can make the hole larger or cause further damage to the tyre. Start the car, plug the inflator into the 12V accessory socket, and inflate the tyre to the recommended pressure.

Once inflated, you can continue driving. However, keep your speed below 80kph and avoid driving more than 200km, as the sealant provides only a temporary repair. Visit a tyre repair shop as soon as possible, where a technician will remove the nail or screw, clean out the sealant, and install a permanent internal patch (patch-plug).

The biggest advantage of this type of repair kit is its convenience. The entire process takes about 10 minutes and does not require lifting the vehicle with a jack. It also helps you get back on the road quickly, reducing time spent waiting on the roadside. The downside is that it is only a temporary solution. The sealant must be cleaned from inside the tyre before a permanent repair can be carried out, which may increase repair costs. In some cases, the sealant can also clog the tyre pressure monitoring system (TPMS) sensor, affecting tyre pressure readings or even causing permanent damage to the sensor.

Type 2: String plug repair kit

Also known as a tyre plug repair kit, a string plug puncture repair kit is an older, more affordable option because it does not require any electrical equipment. It typically includes rubber string plugs (or worms), an insertion tool, a reamer to clean and prepare the puncture, an adhesive lubricant, and a cutter to trim the excess plug.

Unlike a tyre inflator with a sealant kit, this type of repair requires you to remove the nail or screw that caused the puncture. Once it has been removed, insert the reamer into the puncture and move it up and down several times. This clears away debris, removes jagged steel belt fragments, roughens the rubber surface, and slightly enlarges the hole to help the plug bond securely.

Next, thread a rubber string plug halfway through the eye of the insertion tool and apply the adhesive lubricant. Push the plug into the puncture until about an inch remains visible outside the tyre. Then pull the insertion tool out firmly. The tool is designed to release the plug while leaving it securely wedged inside the tyre.

Trim the excess rubber using the cutter and inflate the tyre to the recommended pressure. Finally, apply a soapy water solution to the repaired area. If no bubbles appear, the puncture has been successfully sealed.

One advantage of a string plug repair kit is that it is quick to use and can often last longer than a sealant-based repair. In some cases, the plug may remain effective for a considerable distance. However, it is still considered a temporary repair because it does not provide the same level of sealing as a professional internal repair. There is also a risk that the reaming process may damage the tyre’s internal structure or enlarge the puncture, making a permanent repair more difficult.

What to do after repairing a puncture

Get the tyre professionally inspected

Using a puncture repair kit gets you back on the road, but it should not be considered a permanent solution. Visit a tyre repair shop as soon as possible and have the tyre inspected by a qualified technician. They will check for hidden internal damage that may not be visible from the outside and determine whether the tyre can be safely repaired or needs to be replaced. If the puncture is within the repairable tread area and the tyre is otherwise in good condition, a professional repair can be carried out. However, if the damage extends to the sidewall, shoulder, or internal structure of the tyre, replacement is the safest option.