At road.cc 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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Weldtite Tubeless Sealant offers reasonable protection for punctures up to a claimed 6mm wide. The large 1L bottle offers good value and does not appear to dry out as quickly as some, but then it isn't the fastest at sealing when a tyre does suffer a puncture
When testing the Weldtite sealant I used it on a full range of bikes, including a road bike, a gravel bike and a mountain bike. The quantity recommended ranges from 40ml in narrow (18-23mm) tyres to 60ml in a 28-35mm road-plus or smaller gravel tyres, and up to 120ml for 29in mountain bike tyres.
This quantity for some sizes is more than some other brands suggest, with Hutchinson Protect'Air Max being 30ml for road and 60ml for 29ers, for example. Stan's No Tubes suggests 60ml for road and 120ml for mountain bike, as does Panaracer with its Seal Smart. The 1L Weldtite bottle provides enough for eight tyres, even at the maximum recommended 120ml per tyre.
Recommendations for installation are for it to be poured directly into the tyre, which suits tyres that seal easily, and this was the option I used most frequently.
Weldtite doesn't say anything about installing this through a coreless valve. For some hard-to-inflate tyre/rim combinations this method can be preferable, as it reduces wasted sealant, and in practice I found it worked absolutely fine. It does not have any large particles within it, as some do, such as Stan's No Tubes Race. Those cannot be installed through a valve as the particles will likely block the valve.
After installation, every test tyre held air in every instance. The sealant was left in for over a month and during this time it didn't dry out within the tyres, or show any sign of drying out quickly, which some sealant can.
I had no punctures that I noticed, which either means it sealed them without me knowing or I was lucky not to have any.
To fully test the sealant I used it at the quantity recommended and purposefully punctured a worn tubeless road tyre inflated to 80psi with pins and nails of different thicknesses.
When the tyre was punctured with a small pin roughly the size of a thorn it sealed instantly, but when punctured with an oval wire nail it bubbled for several minutes, not sealing perfectly straight away – as a result, it lost a little air pressure.
Compared to others I have tested in the same way it's middling, although some of the more effective sealants – Stan's No Tubes Race Sealant in particular – dry out much quicker too.
The 1L bottle offers quite good value against those only sold in smaller bottles. Against similar sizes it's competitive: Muc-Off Tubeless Sealant is £29.99 for a litre, for instance, while Hutchinson Protect'Air Max is a little cheaper at £25.99 per litre.
For value and puncture resistance, Weldtite Tubeless Sealant is reasonably good. For riders looking for long-lasting protection in an area where thorns are the biggest risk – rather than flint or glass cuts – it's certainly worth considering.
Reasonably effective sealant that lasts well before drying out
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road.cc test report
Make and model: Weldtite Tubeless Sealant
Size tested: 1 litre
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?
Weldtite says: "Specially designed tubeless sealant, synthetic and allergy-free latex formula, strong enough to instantly seal punctures in high pressure tubeless tyres. The new lightweight sealant lasts longer than traditional brands and is guaranteed to outperform the competition.
"Works in temperatures from -14°C to 45°C - Lasts 3 to 9 months dependent upon conditions - Seals holes up to 6mm in diameter."
Tell us some more about the technical aspects of the product?
Long lasting formula (3-9 months between top ups)
Water based & anti-corrosive
Compatible with inner tubes and tubular tyres
Seals holes up to 6mm
No early signs of drying out, as some sealant can.
Tell us how the product performed overall when used for its designed purpose
Offers reasonable puncture resistance, although not the fastest to dry and fully seal. It does appear to last well within the tyre, not drying out too quickly.
Tell us what you particularly liked about the product
Easy to add into the tyre, and can be put in through the valve if you have removable Presta valves.
Tell us what you particularly disliked about the product
It's not the fastest to seal holes.
How does the price compare to that of similar products in the market, including ones recently tested on road.cc?
The 1L bottle offers quite good value against those only sold in smaller bottles. Against similar sizes it's competitive: Muc-Off Tubeless Sealant is £29.99 for a litre, while Hutchinson Protect'Air Max is a little cheaper at £25.99 per litre.
Did you enjoy using the product? Sort of.
Would you consider buying the product? Probably not.
Would you recommend the product to a friend? Maybe
Use this box to explain your overall score
This sealant lasts well and is quite good value, though it's not the fastest at sealing large holes. It's a good middle ground.
About the tester
I usually ride: My best bike is: Cannondale SystemSix
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: road racing, cyclo cross, sportives, mtb, Lots of gravel style riding