The Best Car Tyre Sealant 2021

If you are unlucky enough to have a puncture whilst out on the road, the best temporary repair would be to use a car tyre sealant. They securely plug any leaks and can be used with ease at the roadside alongside a tyre inflator.

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Best Car Tyre Sealant
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The best car tyre sealant is the Slime SDS-500, which seals punctures that are up to 1/4 inch in size and is suitable for use up to 100 miles or 3 days after application. For those with tyres that are 16 inch or smaller, the Holts Tyreweld is the best alternative that’s made in the UK and is one of the cheapest on the market.

Car Tyre Sealant Comparison

Car Tyre SealantMax Tyre SizePuncture Size
Slime SDS-50020 Inch6.35 mm
Holts Tyreweld16 Inch5.5 mm
AirMan Active Seal21 Inch6 mm
RAC Emergency Repair18 Inch6 mm
Terra-S 109900020 Inch6 mm
Goop Instant18 Inch6 mm

Punctures can be unavoidable and they often happen when you least expect it. Due to the fact that most modern cars don’t come with a spare wheel, it’s highly advised to keep a tyre sealant within your car for roadside repairs.

Below is a list of the best car tyre sealants that are easy to use and are ideal as a temporary repair.

The Best Car Tyre Sealant

1. Slime Car Tyre Sealant

Slime Car Tyre Sealant
Slime are a brand that specialize in car tyre sealants and offer a variety of formulas and even complete kits. This particular sealant is suitable for tyres up to 20 inch and can be used for up to 3 days or 100 miles after application.

In terms of using the sealant, use the supplied tool to fully deflate the tyres and attempt to remove any objects (normally a screw). Once complete, squeeze the sealant into the tyre and use a car tyre inflator to add air.

Other features of the Slime Car Tyre Sealant include:

  • Seals punctures up to 1/4 inch
  • Use for up to 3 day or 100 miles after application
  • Compatible with cars that use TPMS
  • Non-toxic and water soluble
  • Easy to use
  • Made in the USA

The Slime Car Tyre Sealant ticks all the boxes and as long as you follow the instructions, it will do exactly what’s intended. It’s easy to use and is the perfect temporary repair that can be used to keep you on the road.
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2. Holts Tyreweld Puncture Repair

Holts Tyreweld Puncture Repair
By far the most popular and also the cheapest car tyre sealant in the UK is the Holts Tyreweld. It’s suitable for tyres up to 16 inch and takes just 90 seconds to seal any leaks caused by a puncture.

Other features of the Holts Tyreweld include:

  • Suitable for tyres up to 16 inch
  • Available in 3 sizes (300, 400 & 500 ml)
  • Easily washes out after use
  • Non-toxic formulation
  • Made in the UK

The Holts Tyreweld is the best cheap car tyre sealant that actually works and is ideal for slow punctures. The only main drawback is that it’s only suitable for tyres up to 16 inch but apart from that, it’s easy to use and won’t disappoint.
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3. AirMan Active Seal Tyre Sealant

AirMan Active Seal Tyre Sealant
Another popular and highly rated tyre sealant for cars is by the AirMan brand. According to the brand, it’s suitable for all passenger cars on UK roads and seals punctures on tyre sizes up to 21 inch.

Other features of the AirMan Active Seal include:

  • TPMS safe and non-toxic
  • Suitable for tyres up to 21 inch
  • Compatible with any inflator
  • Easily rinses out of the tyre
  • Made in Germany

The AirMan Active Seal is an excellent all-round car tyre sealant and a perfect OEM replacement. It can also be used for tyres up to 21 inch, which makes is suitable for the majority of cars, vans or SUV’s on the road.
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4. RAC Emergency Car Tyre Sealant

RAC Emergency Car Tyre Sealant
Another affordable car tyre sealant that’s manufactured in the UK by a reputable brand is the RAC alternative. It’s a water based formula that’s MIRA approved and quickly seals punctures up to 6 mm in size.

Other features of the RAC Emergency Tyre Sealant include:

  • Works with any tyre inflator
  • Water based and latex free
  • Easily rinsed out once the tyre is repaired
  • MIRA approved formula
  • Made in the UK

Considering that this car tyre sealant is relatively cheap, made in the UK and developed by the RAC, you cannot go wrong. It’s far cheaper than a replacement at a main dealer and perfect to keep stored in your car for emergency use.
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5. Terra-S 1099000 Tyre Sealant

Terra-S 1099000 Tyre Sealant
The Terra-S Sealant is another popular and highly rated formula that’s available in a choice of sizes. It comes as a 4 piece kit that allows you to easily deflate, seal and re-inflate your tyres in a matter of minutes at the roadside.

Other features of the Terra-S Sealant include:

  • Seals punctures up to 6 mm
  • Compatible with all compressors
  • Easy to use squeeze bottle
  • 450, 600 or 750 ml bottles
  • Shelf live of 4 years

Apart from the slightly expensive price tag, the Terra-S formula is highly rated and a great alternative to what the main dealers try to sell you at a much more inflated price.
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6. GOOP Instant Puncture Repair Sealant

GOOP Instant Puncture Repair Sealant
Goop are another brand that specialize in tyre sealants for cars and their instant puncture repair formula is their most rated product. Unlike any of the alternatives, this sealant is designed to be used before you have a puncture and seals any punctures when they occur. It’s also perfect for preventing flat tyres occurring from leaky wheels.

Other features of the Goop Instant Puncture Repair include:

  • Suitable for tubed and tubeless tyres
  • Washes away with water
  • Supplied with valve tool
  • Lasts the life of the tyre
  • Suitable for tyres up to 18 inch
  • Made in the UK

If you are someone that’s unlucky enough to get multiple punctures or regularly drive on work sites, the Goop formula is perfect. It’s suitable for the majority of tyres and provides peace of mind that punctures will no longer be an issue.
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Punctures often happen when you least expect it and can potentially ruin a road tip, family holiday or other important drives. However, by investing into one of the above car tyre sealants, you can keep your car on the road and drive for up to 100 miles (with certain sealants).

All of our recommendations are designed to be used on all passenger vehicles and are compatible with all tyre inflators. To avoid disappointment, it’s advised that you check your car tyre size and choose an appropriate formula.

author dan 4car

Written By Dan

Dan has been a car enthusiast ever since he can remember and has an extensive range of cars that include classic cars that he has restored himself from a barn find condition to modern performance cars. Whether you need advice on how to install car parts or recommendations on what products to buy, Dan’s first-hand experience will certainly help.

If you want to find out more about Dan, our testing process or the website itself, visit our about page for further information.

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