Weldtite Tubeless Sealant review

Weldtite Tubeless Sealant is a water-based option with benefits. Not only is it CO2 compatible, it remains in liquid form for months without showing any signs of drying out. The smaller bottle has a few neat features, but the overall sealing performance is lacking during our puncture tests which affects its rating among the best tubeless sealants.

Weldtite Tubeless Sealant – Technical details

Two size options of Weldtite's Tubeless Sealant are available: a 240ml bottle designed to fill a pair of chunky MTB tyres and a larger 1-litre bottle for anyone who may need more or wants to have the option of top-ups. The smaller bottle has a cap that can be used to remove valve cores and an integrated tube for simpler pouring through a valve core. Suggested quantities range from 40ml for a narrow road tyre, to 120ml for a 29-inch/DH tyre.

The solution is water-based, latex-free and is claimed by the brand as being non-toxic. It is CO2 compatible, which could make it suitable for use after a trailside repair or for anyone who might be tempted to use a CO2 cartridge for the initial inflation of a stubborn tyre.

The biggest claim is longevity, with a guarantee to last at least nine months inside the tyre used in temperate riding conditions. The functional range suggested by Weldtite is -14°C to +45°C.

Weldtite Tubeless Sealant – Performance

To test sealant performance, we created a standardised puncture test to assess each contender. The same exact tyre on the same rim for each sealant. The tyre used was a Halo GXC, measuring 47mm. Tyre sealant was added in the amount suggested by the manufacturer, and the tyre was inflated to 40psi. This pressure was chosen to give a realistic tyre pressure for all areas of off-road riding. A digital tyre pressure gauge was used to ensure that the pressure was identical on each test. After that, the tyre was rotated sufficiently to ensure that it was distributed evenly throughout the tyre. The tyres were all punctured by driving a 3mm nail through the carcass. The wheel was rotated to assess if the sealant had successfully sealed the hole. If the sealant worked, the test was repeated using a 5mm diameter nail, and if successful on the larger hole the remaining air pressure was measured with a digital pressure gauge and the result was recorded.

On the larger 5mm hole, the Weldtite sealant performed below average, while it did seal, a significant amount of air pressure was lost, leaving only 25psi.

It showed some promise when the smaller hole created a very quick seal with only a light spray. This was very different when the larger puncture was formed with a sizable amount of spray that lasted for multiple wheel rotations.

The sealant performed well in the tyre and the longevity was outstanding and remained in liquid form for months. After the testing had finished, it washed out easily and left no residue or other sign that the sealant had been used.

Weldtite Tubeless Sealant– Verdict

Weldtite Tubeless Sealant is available in the smaller 240ml bottle for £10.49 and the larger 1-litre option for £29.99. The larger bottle is at an identical price point to many other sealant options, including some of the top-performing sealants we have tested (Peaty’s Holeshot and Vittoria Universal tubeless sealant). The smaller 240ml is enough for two tyres but a little more sealant is required to adequately fill gravel and mountain bike tyres.

It is unfortunate that the performance can't fully match other options when repairing larger punctures because it lasts far longer than its rivals which places it among the top options among the best tubeless sealants. Its longevity and ability to remain in liquid form may be worth the risk for those who think smaller thorns or punctures of a similar size present the greatest risk, but for sealing performance alone, it cannot compete with the best existing options.