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Zefal Repair Spray



It won't fix every puncture but it'll sort the majority to get you on your way quickly

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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This tin of Zefal Repair Spray is a nifty little addition to your ride kit if you aren't a fan of fixing punctures at the side of the road, or are often up against the clock whether racing or commuting. It's not a guaranteed fix for every occasion, but nine times out of ten it'll get you home.

  • Pros: Works on the majority of small punctures from thorns and flints; cheap fix
  • Cons: Attaching to the valve can be fiddly; only fixes holes up to 2mm

The Zefal Repair Spray isn't a tubeless sealant. It's similar, as in it'll react with the air at the surface of the inner tube or tubeless tyre, turning into a solid to plug the hole, but it is purely a temporary solution to get you home/to work/finish the race.

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It doesn't just inject the sealant, though, the compressed gas will also inflate your tyre at the same time – ideal if you are travelling light without tube and pump.

I really don't suffer from a lot of punctures as I tend to keep the pressures up to what most people in this day and age reckon is too hard, but hey, it works for me.

In 2019 with 8,500 miles covered, with a split of about 60/40 between road and gravel, I had maybe three flats. Two were from thorns, so small holes, and the other was a short slit no doubt caused by some glass or flint.

Testing the Repair Spray in the workshop, I replicated these kind of intrusions using a drawing pin and then a 2mm slit with a Stanley knife through a 28mm tyre and an inner tube.

The Repair Spray can be fitted to both Presta and Schrader valves (the former by an adaptor that screws into the end of the tube), although you have to be 100 per cent sure it is on correctly.

With the fittings being plastic, it is very easy to cross thread things if you are in a hurry or being a bit hamfisted, and the first you'll know about it is when the sealant starts going everywhere but in the valve...

If you've fitted it right, though, holding the bottle upside down and pushing the button will see the tyre inflate. I got about 40-50psi into the 28mm tyre – enough to get you home if needs be, but Zefal recommends you ride for about 3km to get the sealant all around the tyre and then inflate it up to your preferred pressure with a pump.

> All you need to know about mini pumps + 6 of the best

I pumped the tyre up to about 80psi and it remained inflated fine for at least the next 24 hours.

After a couple of days the sealant would have dried out and the tube could possibly leak again, but it had done the job of getting me home so that I could fix or replace it.

I say 'would have' dried out, because that is what Zefal says will happen. I couldn't test that because I went on to put a bigger slit into the tyre and tube with the knife, about 1mm thick and 5mm long, just to check Zefal's claims that it'll only work on holes up to 2mm.

It had a pretty good go at fixing the hole but it was just a bit too big to let the sealant set before it was being let out through the hole, so this would be a roadside repair job.

> How to fix a puncture

This 100ml tube (75mm and 150ml are available) has an rrp of £5.99, although you can get it for under a fiver if you shop around.

It's more expensive than a patch, but if you are in a rush or the weather is atrocious it certainly pays for itself, in my eyes. Its size also means that it will fit in a jersey pocket, or it is available with a mounting kit.

It certainly looks a bargain compared to the 125ml Kwiki Sealant Inflator at £14.99, although that does look to get more pressure into your tyres by a fair bit, compared to the Zefal.

Decathlon offers its own version for just £1.99 at the time of writing. It only seals holes up to 1mm, though.

Overall, the Zefal is a great little solution to keep you moving when out on the road in the majority of situations. After testing, I've since bought a couple of cans to keep in my rucksack just in case.


It won't fix every puncture but it'll sort the majority to get you on your way quickly

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Make and model: Zefal Repair Spray

Size tested: 100ml

Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Zefal says, "Our Repair Spray repairs and instantly reinflates flat tyres without having to change the inner tube. This type of rapid and simple fix allows you to continue your ride without having to do a repair. The fix isn't long-lasting as the product that is injected dries out in a few days. It is advisable to change the inner tube or to repair it. The Repair Spray becomes less effective against punctures larger than 2mm."

It does exactly what it says on the tin, literally.

Tell us some more about the technical aspects of the product?

Zefal lists:


No need to change the inner tube whilst out.



All types of tyres - tubeless or standard with inner tubes.



Compact, it can be attached to the bike with a mounting system.

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for value:

Tell us how the product performed overall when used for its designed purpose

It sealed smaller punctures quickly and without mess.

Tell us what you particularly liked about the product

Can get you out of a fix very quickly.

Tell us what you particularly disliked about the product

Attaching it to the valve can be a little tricky.

How does the price compare to that of similar products in the market, including ones recently tested on

It's cheaper than the Kwiki inflator mentioned in the review by a fair bit, and although Decathlon's offering is cheap it doesn't sound as effective.

Did you enjoy using the product? Yes

Would you consider buying the product? I since have.

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

It's great! It would fix the majority of puncture types that I seem to suffer with, and for quite a small outlay too.

Overall rating: 8/10

About the tester

Age: 41  Height: 180cm  Weight: 76kg

I usually ride: This month's test bike  My best bike is: B'Twin Ultra CF draped in the latest bling test components

I've been riding for: Over 20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed

With 20 years of road cycling and over 150,000 miles in his legs it's safe to say Stu is happiest when on the bike whatever the weather. Since writing his first review for back in 2009 he has also had a career in engineering including 3D-CAD design and product development, so has a real passion for all of the latest technology coming through in the industry but is also a sucker for a classic steel frame, skinny tyres, rim brakes and a damn good paintjob.
His fascination with gravel bikes is getting out of control too!

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