Best tubeless sealant 2026: which one of these five sealed the biggest hole in our experts' piercing test
Tubeless sealant is engineered to eliminate flats and seal punctures, so our experts have put them to the test. Which of these five seals the biggest hole?
Best Eco-Friendly
4. EFFETTO MARIPOSA VÉGÉTALEX TYRE SEALANT
Eco-friendly with reasonable sealing ability
Specifications
Claimed sealing ability:3mm at high pressures, 5mm low pressures
Tested sealing ability :3mm
Claimed longevity:3 months to over 6 months
Application:Injectable
Minimum temperature :-4°F / -20°C
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Eco friendly choice
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Reasonable sealing performance
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Valve injectable
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Mid range price
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Compatible with CO2
Reasons to avoid
- Sealing ability isn't as good as others on the market
Effetto Mariposa's Végétalex Tyre Sealant is quite different to anything else we've used. It's got a gloppy, almost oily, gelatinous consistency to it, which is a result of its plant-based ingredients – it's fully biodegradable and totally plastic-free.
That thicker consistency could be what gives this sealant its impressive claimed longevity. Although it states three months, Effetto is explicit that this is the minimum in the most extreme conditions – not just the lower band of what most people will experience in more 'normal' use.
But longevity wasn't what we were testing for here – so back to its puncture-sealing abilities. The sealant managed to plug the 1, 2 and 3mm screwdrivers without much of a problem.
Going up to 4.5mm, it took quite a long time for the air to finally stop leaking out and a seal to form at a (very) low pressure. When trying to pump the tyre back to pressure, the hole kept on reopening – unlike the Silca and the Muc-Off sealants, the Végétalex seal didn't seem to strengthen after being broken open.
But sealing a 3mm hole at road pressures is all that the sealant claims to be able to do, so it can't really be faulted for its performance – even if it does fail on smaller holes than some of the other sealants on test.
