Best tubeless tire sealant for mountain bike, gravel and road

A tubeless tire being fitted
(Image credit: WTB)

The best tubeless tire sealants plug punctures and cuts in your tire before you even realize you’ve got them, which means more time riding and less time wrestling with muddy tires at the side of the trail. However, self-sealing punctures aren't the only advantage to using a tubeless setup. Tubeless allows much lower tire pressures, which means more grip and control on rowdy descents without the risk of pinch flats or snakebites so you can ride faster.

While you often hear horror stories of messy tubeless home conversion attempts, using one of the best bike floor pumps, setting up a tubeless tire to a tubeless rim is actually very straightforward these days, plus there is no risk of accidentally pinching tubes when wrestling on tight tires.

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We’ve tested a whole load of the best tubeless tire sealants to see which works best, and which aren’t worth bothering with at all. Even the best mountain bike tires run into punctures or burps, so you shouldn't hesitate to set them up tubeless or top up your sealant. Don't know where to start when looking for tubeless sealant? For everything you need to know, check out our guide to how to buy the best tubeless tire sealant at the bottom of this article.

Best tubeless tire sealant

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Muc-Off No Puncture Hassle tubeless sealant

(Image credit: Muc Off)

Muc-Off No Puncture Hassle tubeless sealant

Pricey but Muc-Off’s pink mix is a brilliant all-round investment

Specifications

Type: Downhill / Enduro / Road
Max hole size: 6mm
Lifespan: 6 months

Reasons to buy

+
Fast reacting, excellent performance
+
UV-sensitive for detecting holes
+
Lasts a long time
+
Smells nice

Reasons to avoid

-
On the pricey side

Muc-Off’s signature pink sealant is on the pricey side but it’s worth the investment as it works brilliantly in any situation. Both cost and performance are less surprising when you find out the brand has been trying various recipes for six years with every tire brand and riding style around, and it even built an oven for testing mixes in different temperatures. 

The result is a great blend of fast-reacting mobility, so it’s worked great for road commuting and even on big sidewall splits on off-road bikes. We even had a fractured and bulged carbon MTB rim seal so fast we rode it home without even needing to top up the pressure. 

The sealant also shines under a UV light (you get a UV torch with the $14.99/£10.99 sealant kit and bigger 1L and 5L bottles) to help you spot holes that you didn’t notice at the time but may want to plug for longer-term security. It also shows micro leaks in porous ‘tubeless ready’ sidewalls so you know where to apply further sealant. It lasts a long time in all weather conditions without forming boogers, it’s fine with CO2 inflation and it even smells pretty nice. 

OKO Magic Milk Hi-Fibre

(Image credit: OKO)

OKO Magic Milk Hi-Fibre

Reliably effective sealant at a very good price

Specifications

Type: Downhill / Enduro / Road
Max hole size: 6mm
Lifespan: 6+ months

Reasons to buy

+
Non-allergic latex mix
+
Good performance, even on larger holes

Reasons to avoid

-
More expensive in the US

If this was a tire sealant test for motorcyclists, farmers, HGV drivers or earthmover specialists, OKO would be the most recognized name here, but it’s not even on the radar for most bike riders. We even know some riders who use their tractor mix diluted down for their bikes because they didn’t know there were bike-specific versions. That’s a bit rude considering the UK firm was one of the pioneers of liquid tire sealants for heavy-duty vehicles back in the 70s. Even at the full retail price, its Magic Milk sealant is half the price of some better-known brands but with online shops regularly discounting massively, it’s often even more of a bargain.

Low-cost doesn’t mean low performance either. The standard Magic Milk formula is a synthetic ammonia-free, non-allergic latex mix that’s great for coating porous tires and fast fixing small to medium-sized holes. It’s happy with a wide range of temperatures and while it coats tires well it doesn’t ‘booger up’ either, so you just need to top up after a few months. As the name suggests Magic Milk Hi-Fibre is loaded with microfibers for a faster seal of bigger holes, and it’s the same price as the normal mixture so MTBers aren’t paying a premium.

Squirt Cycling Products Sealant

(Image credit: Squirt Cycling Products)

Squirt SEAL tire sealant

Fast-acting, race-proven, eco-friendly sealant that's easy on the wallet

Specifications

Type: Downhill / Enduro / Road
Max hole size: 6mm
Lifespan: Not stated

Reasons to buy

+
Long-lasting formula
+
Affordable
+
Ammonia-free mixture
+
BeadBlock granules quickly thwart leaks

Reasons to avoid

-
Doesn't play nicely with CO2 

Dubbed by many testers as the 'white gold' of tire sealants, Squirt's SEAL tire mixture is fast becoming the go-to remedy for mountain bikers all over the world - especially those who traverse the hostile and often unforgiving trails of marathon stage racing and need fast-acting puncture protection.

Squirt's SEAL sealant is not limited to mountain bike use exclusively but can also be used for road and gravel tires, too. Furthermore, the sealant is compatible with both tubed and tubeless applications and fosters effective puncture-sealing properties.

Available in three bottle sizes - 150ml, 1L and 5L - Squirt caters for all disciplines as well as ensuring each of its products is green and safe for the environment. That said, this particular sealant boasts minimal to zero bioaccumulation.

Stan’s No Tubes Race sealant

(Image credit: Stan's)

Stan’s No Tubes Race sealant

Expensive but this evolved version of the original is one of the best

Specifications

Type: Downhill / Enduro / Road
Max hole size: 6.5mm
Lifespan: 6 months

Reasons to buy

+
Works in a wide temperature range
+
Race mix plugs larger holes well

Reasons to avoid

-
Not great with CO2 cartridges
-
Smells bad
-
Expensive

Stan’s No Tubes can be credited with getting the whole tubeless setup ball rolling with its cunning conversion kits at a time when most tubeless tire and rim systems were a heavy, numb-riding headache. You can still get its original latex-based sealant too, and if you’re only looking to coat a tire to seal it and heal small holes fast - e.g. on the road - then the lightweight mix performs well. It’s also available in smaller-sized bottles as well. The Race mix contains bigger crystals in the same base mixture and works significantly better to plug the bigger holes and splits that come with rough off-road play. 

Either mix is tolerant of a wide temperature range and you’ll normally be more than halfway through the year before it starts to form ‘Stanimal’ clumps. It’s not so happy when used with CO2 cartridges though and it smells a bit acrid, too.

Effetto Caffelatex sealant

(Image credit: Effetto Mariposa)

Effetto Caffelatex sealant

Fast-acting foaming sealant at a good price

Specifications

Type: Downhill / Enduro / Road
Max hole size: 5mm
Lifespan: Not stated

Reasons to buy

+
Foams when it seals
+
Holds high pressures reliably
+
Good for road use

Reasons to avoid

-
Requires an additional supplement to cope with larger holes

Effetto Mariposa takes a suitably Italian approach to solving punctures with its Caffelatex sealant. Not only does it have a light coffee-colored tinge but the very fluid, lightweight mix starts to foam when forced through holes, creating a distinctive ‘crema’ as it seals. Not only is this entertaining in a slightly rabid way, but it also seals small to intermediate holes really rapidly and holds high pressures fairly reliably afterward. Add a reasonable lifespan and decent value pricing in the larger bottles and that makes it great for road use. The basic mix struggles to plug bigger holes and hold them shut once you start thumping about post-puncture though, so Effetto makes a ‘Vitamina CL’ additive supplement for plugging bigger holes more effectively. 

Panaracer SealSmart sealant

(Image credit: Panaracer)

Panaracer SealSmart sealant

Effective but expensive nut-enriched natural recipe

Specifications

Type: Downhill / Enduro / Road
Max hole size: 6mm
Lifespan: 6 months

Reasons to buy

+
Most natural sealant available

Reasons to avoid

-
Comparatively expensive

Japanese tire company Panaracer has taken a while to get into the sealant business but its 2019 introduction was completely nuts. Okay, not completely nuts as the main carrier liquid is a natural latex rubber, but the gritty, hole-blocking ingredient is crushed walnut shells. That makes it the most natural sealant available and - presuming you don’t have a nut allergy - it’s one of the kindest mixes for skin and bike if it gets spilled. It works pretty well too, clogging small to medium-sized holes quickly and holding pressure well afterward once the walnuts are wadded together. With a bit of help tapping the tire round to flood the area, it’ll handle big holes and sizeable slashes.

Hutchinson Protect’Air Max

(Image credit: Hutchinson)

Hutchinson Protect’ Air Max

Well priced for road users but needs additives for aggro use

Specifications

Type: Downhill / Enduro / Road
Max hole size: 1-2mm
Lifespan: Not stated

Reasons to buy

+
Fluid, lightweight mix
+
Fast to coat porous tubeless-ready tires
+
Aids installation

Reasons to avoid

-
Struggles to plug larger holes

Hutchinson was one of the pioneers of tubeless and tubeless-ready tires and was into the sealant game early too. It’s a very fluid, lightweight mix designed to coat porous tubeless-ready tires fast, and it’s slippery enough to help installation too. That all makes it good for road and gravel/cyclo-cross use, especially as it’s really well priced for a shop-supplied - rather than direct buy - product. Where it struggles is plugging and holding larger holes and slashes reliably, so you’re going to need to add some DIY bits or another thicker, latex-based sealant if you want it to handle more traumatic environments. 

Bontrager TLR sealant

(Image credit: Bontrager )

Bontrager TLR sealant

Reasonably priced, user-friendly, small hole sealant

Specifications

Type: Downhill / Enduro / Road
Max hole size: 6.5mm
Lifespan: Not stated

Reasons to buy

+
Seals well
+
Ammonia-free mix

Reasons to avoid

-
Not effective on larger holes

Another early adopter of TubeLess Ready (TLR) tire tech, Bontrager’s lightweight milk is also typical of early generation mixes. The rise of tubeless road tires has given it a second lease of life as it rushes to small holes and rips quickly and generally seals them well. It also coats tires well and eases installation which is particularly useful if you’re using Bontrager’s super tight rims and tires. It stays mobile at a wide range of temperatures for a long time too, and it’s ammonia-free so it’s relatively skin/paint/metal friendly. The sealant represents decent value compared to its rivals, although it only comes in a quart bottle.

If you want it to cope with more gaping damage, you’re going to need some glitter or something similar mixed into the recipe, and Bontrager’s recommended dosages (e.g. 60ml for a 29er) are definitely on the low side for long-term, multiple puncture protection.

Vittoria Pit Stop TNT latex sealant

(Image credit: Vittoria )

Vittoria Pit Stop TNT latex sealant

Works fast for small holes but less consistent on larger wounds

Specifications

Type: Road
Max hole size: 6.5mm
Lifespan: Not stated

Reasons to buy

+
Fast-acting
+
Stays plugged

Reasons to avoid

-
Not great at sealing larger gashes

Vittoria’s Pit Stop TNT (or the EVO version) is worth a glance if you tend to get small holes that need fixing fast before you lose a lot of pressure. It’s a very liquid mixture so it swills around the tire easily, helping with mounting, sealing porous carcasses and getting to any holes fast. 

The latex mix seals very quickly too, so there’s minimal pressure lost or spray on your frame, and it generally stays plugged reliably afterward. It’s not as effective at plugging larger holes and slashes/knob tears though, so it’s less suitable for aggressive off-road users. It’s also more expensive than more consistent, versatile mixes like original Stan’s, and while the double-headed dispenser bottle arrangement looks ingenious it's more awkward to use in practice than a separate scoop. 

Orange Seal sealant

(Image credit: Orange Seal)

Orange Seal Endurance Sealant with Inj System

Great for bigger holes but very expensive and needs regular refreshing

Specifications

Type: Downhill / Enduro / Road
Max hole size: 6mm
Lifespan: 45 days

Reasons to buy

+
Few equals at plugging large holes
+
Temperature tolerant

Reasons to avoid

-
Expensive
-
Short lifespan

Orange Seal may be pricey but it's got few equals when it comes to plugging big holes fast. We’ve had good results watching the mixture seal holes a couple of mm bigger than their claimed 6mm limit without losing much pressure, and it coats porous lightweight tires really well, too. 

You’ll still be lucky if it lives up to its 19mm slash sealing claims but the ‘nanite’ enriched mixture deals with partially torn knob gaps and more normal trailside - rather than sword-fighting sized - slashes well. The latex-based mix is also reasonably temperature tolerant unless you’re going ice biking. The downside is that it degrades really really quickly  (4-6 weeks is the Orange Seal advised top-up time), which makes it an expensive refill.

While the Endurance version doubles the lifespan it’s not nearly as good at sealing medium to large holes. Even when it does plug bigger gaps, it struggles to hold higher pressures too before blowing out. It’s still useful as a road/gravel tire mix, particularly with a porous ‘tubeless ready’ tire that needs a good base coat of sealant.

How to buy the best tubeless tire sealant

How does tubeless tire sealant work?

Sealant is designed to do exactly what it says on the bottle: seal small holes in your tires to stop the air from escaping. The base liquid is generally water-based (glycol or propylene) with added cellulose thickeners or a latex-derived mixture. These stay liquid in the tire so they can swill round to the puncture site easily but solidify when they’re forced through a small hole under pressure. The exact composition of the sealant defines how liquid it is and how it reacts when it gets to the puncture in terms of sealing speed and the size of the hole it can plug. 

For example, Specialized’s RapidAir is designed for sealing small holes very quickly in a road riding scenario while Orange Seal’s Endurance blend is slower moving but can block bigger holes, making it more suitable for MTB use.

What type of formula is best?

While the base liquid mix makes a difference most sealants also include extra ‘bits’ in them to help plug the hole faster. Depending on the brand these can be given all kinds of fancy names including; particulate, additives, crystals, polymers, fibers etc, but as a general rule the bigger the bits, the bigger the hole the sealant can plug. More liquid sealants can get to the hole faster though so if you’ve not got much air to spare, a more liquid mix might be better. 

How much tire sealant should you use?

As tubeless sealant seems expensive and you’re adding weight to your bike it’s tempting not to put much in. You need to remember that you’re effectively replacing an inner tube that can weigh from 100g (road) to 250g (large MTB) and cost around $20 / £12 depending on how shrewd your shopping is, so you’re generally still winning on weight and cost with tubeless. The bottom line is that the more sealant there is in the tire the more there is to plug multiple holes or keep trying to plug one big one. While different manufacturers suggest different amounts we find a relatively simple formula based on twice the ml of sealant to the mm width of the tire (e.g. 50ml in 25mm tire, 80ml in a 40mm tire 120mm in a 60mm / 2.4in tire) is enough to coat the tire and leave some left for plugging holes. If you know you’re heading into cactus country or broken glass backroads on a regular basis, use more. Also, larger diameter tires will obviously need more than smaller tires.

How long does tubeless tire sealant last?

You’ll only get the intended mixture of bits and liquid in your tires if you make sure you shake the bottle really well before loading up the tire. Otherwise, the contents will settle in storage and the first tires you fill from a big bottle will only have largely useless liquid in them. That means you’ll be left with a load of sludge in the base of the bottle, not in your tires where it needs to be.

More recent mixes tend to stay in solution better inside your tires and sealants will always work and last better in regularly used setups than ones left to stand. However, some recipes (particularly older, simpler ones) can coagulate and lump together in ‘boogers’ or ‘Stanimals,’ making the mix much less effective at sealing holes. Really big lumps can even be felt in the rotation of lightweight tires.

Different brands also quote wide-ranging lifespans for their tires from OKO’s optimistic ‘lifetime’ to Orange Seal’s butterfly-style 'month and a bit'. Extremes of temperature can affect different mixes too so it’s worth checking if you’re heading to the Arctic or Arabia. Be careful using CO2 cartridges with some mixes as the freezing temperatures of the released gas can kill the mix.

That means while it’s a pain, unseating tires to check the state of your mix is definitely a good idea if you want your tubeless setup to work the way it should.

Is there anything else I should know?

While we’ve listed different sealants in our puncture beating round-up we actually used several more in our hunt for the best. In the case of Schwalbe’s Doc Blue, it’s basically the same as Stan’s original No Tubes sealant (it’s made by Stan’s) but more expensive. Continental’s RevoSealant is very liquid so works okay for road tires, but struggles with bigger holes and is expensive. The two we’d actively avoid are Finish Line and Peaty’s which are too thick to react to road tire punctures before total deflation and aren’t even very good at plugging medium to large holes.

You need to remember that if you can’t find your favorite, any of these recipes can be altered to suit your needs. Thick liquids can be diluted with more latex or a lighter solution, and thin ones can be bulked up with a thicker brand or DIY additives like glitter. Be sure to mix latex-based sealants with latex and water-based sealants with water though or they won’t work well together.

Finally, lots of riders make their own home-brew sealants from latex and glitter (art and craft shops sell both) and we even know one who waters down OKO tractor tire sealant for epic rides on plus tires. For the record, another mate who tried the organic approach never had much luck with eggs or milk-based sealants and it’s surprising how soon they start to really stink!

Guy Kesteven is Bike Perfect and Cyclingnews’ contributing tech editor. Hatched in Yorkshire he's been hardened by riding round it in all weathers since he was a kid. He spent a few years working in bike shops and warehouses before starting writing and testing for bike mags in 1996. Since then he’s written several million words about several thousand test bikes and a ridiculous amount of riding gear. To make sure he rarely sleeps and to fund his custom tandem habit, he’s also penned a handful of bike-related books and talks to a GoPro for YouTube, too.


Rides: Pace RC295, Cotic FlareMax, Specialized Chisel, Vielo V+1 gravel bike, Nicolai FS Enduro, Landescape custom gravel tandem

Height: 180cm

Weight: 69kg

With contributions from