What should I do if I have a slow puncture?

Ellie Dyer-Brown, 2 years ago

5 min read

  • Advice
  • howto
  • buyingguide
Stopping Tyre Leak

Simple advice on how best to identify and fix a slow tyre puncture.

If you know that there is minimal damage to the tyre but there is still a leak, then it is likely there is a leak between the tyre seal and the rim. A leak in the bead seal occurs when the metal rim gets corroded, causing air to seep out.

If this guide to stopping a leak is beyond your mechanical skills, you needn’t worry. We have thousands of dedicated garages around the UK that can fit you a new tyre.

Content Guide:

Why is my tyre flat?

How can I find a tyre leak?

How can I stop air leaking from my wheel or tyre?

How do I stop a leak in the bead seal?

How long does bead sealer take to dry?

Why is my tyre flat?

The top causes of a flat tyre are:

  • Puncture caused by sharp object

  • Failure or damage to valve stem

  • Ripped or rubbed tyre

  • Tyre bead leaks

  • Vandalism

  • Tyre and rim separated due to collision

  • Overinflated tyres

  • Alloy wheel leaks

It's worthwhile noting that if you've accidentally driven around with a flat tyre, the inside of the tube will have been shredded by the wheel, so it will need replacing rather than repairing.

In this instance, if you don't know how to change a tyre yourself or don't have time, you can use WhoCanFixMyCar to find a mobile mechanic who will come to you.

How can I locate where the tyre is leaking?

Using soapy water, or water alone, can help you determine exactly where the leak in the tyre is. In a spray bottle, mix water and soap – now spray the surface of the tyre. Make sure you cover the following:

  • The tread

  • Sidewalls

  • The valve stem

  • The opening (ensure the cap is removed)

  • Along both sides of the rim

Once you’ve covered the surface of the tyre, you’ll find the leak by spotting where the bubbles are forming. Whether you choose to do this by removing the wheel from the car or leaving it on is personal preference. Just turn the steering wheel to expose the inner sidewall of the tyre.

Another way of spotting a tyre leak is to remove the whole tyre and submerge it into a large tub of water (if you don’t have a big enough tub, then do it sections at a time). When bubbles begin to form in the water, you have found the leak.

How can I stop air leaking from my wheel or tyre?

You can stop a leak in your tyre by using a tyre plug kit or tyre puncture sealants.

However, if you'd prefer the peace of mind that comes with having a professional fixing the leak for you, most garages and tyre centres will repair tyres rather than replace them if it's possible to do so.

How to stop air leaking from your car wheel using tyre puncture sealants

  • First things first, always read the instructions on the tyre puncture sealant tube.

  • Pull out any offending objects from the tyre with a pair of plyers. There is a chance that this could be why your tyre is flat.

  • Ensure your wheel is at the top of the car by turning it.

  • Unscrew the valve cap – this is where the sealant will go.

  • Place the nozzle of your sealant onto the valve stem securely and release the contents of the sealant.

  • Rotate your tyre by driving your car. This will ensure sealant is distributed evenly inside the tyre, preventing heavy lumps from forming inside.

How to stop a tyre leak using tyre plug kit

  • Using an impact wrench or a lug wrench, loosen the lug nuts. You need to loosen, or break the lug nuts before you jack up the vehicle so that the weight of the vehicle is still on the wheels. This prevents dangerous spinning when you turn the lugs later on.

  • On a level surface, safely jack up the car using jack stands.

  • Using a wrench, remove the lug nuts and remove the wheel from the hub.

  • Remove any offending objects from the tyre with some pliers or follow the above steps to find the leak.

  • With a rasp tool in the tyre plug kit, clean the hole. This will roughen the area enabling the fix to hold.

  • In your repair kit you will have plug & insertion tool – thread the plug through the insertion tool.

  • Lubricate the plug with adhesive – this will create a better fix.

  • Force the plug into the tyre using the insertion tool and let the adhesive dry.

  • Cut away any protruding plugs from the exterior of the tyre.

  • Pump up the tyre.

  • Apply soapy water to the tyre to check if the seal is holding  – if it isn’t add some more adhesive.

  • Attach the wheel back onto the car.

  • Lower the car, tighten the lug nuts and replace the tyre.

Sealants and plugs are not a long term solution for getting your tyre repaired – they last for about 100 miles. This type of repair should be used as an emergency repair or quick fix.  Book in at a local garage near you to get your car tyre repaired to avoid future issues.

How do I stop a leak in the bead seal?

A leak in the bead seal occurs when water infiltrates the wheel and sits where the tyre and the rim meet. This area is called the bead seal area, and the metal slowly corrodes as the leak is created. Bead seal leaks are most prominent in alloy or aluminium rims.

  • Remove the wheel from the car.

  • Remove any excess air left in the tyre by putting pressure on the valve stem. This will expose the bead seal area, on both the tyre and the rim. Don’t worry – you don’t need to remove the tyre from the rim!

  • Get rid of the corroded parts of the rim. This can be done by running a buffing wheel specifically made for removing corrosion along the bead seal. It polishes the rim, giving it a  smooth surface.

  • With solvent appropriate for rubber, wipe the area of the tyre that touches the rim. This will clean the dirt off the tyre and help to create a better seal when the tyre is inflated.

  • On the rim’s bead seal, apply a layer of tyre glue with the tip of your finger or a cotton swab. This isn’t essential, but can prevent future corrosion as it will inhibit moisture from penetrating the rim again.

  • Inflate the tyre and remount it on the vehicle.

How long does bead sealer take to dry?

Most silicone tyre sealants will take up to 24 hours to dry completely. Check the instructions on your sealant to find out how long you'll need to wait.

If you’ve got a leak in your tyre, find the best garages near you and get quotes for free in minutes with WhoCanFixMyCar – we’ve sourced thousands of garages so that you can get your car fixed with ease!

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