OKO have been tyre sealant suppliers for 42 years.

Tyre sealant runs around the inside of the tyre tread. Thus in most instances it should not come into contact with an internal TPMS (Tyre Pressure Monitoring System) valve sensor when in use. However, when fitting OKO you may cause the sensor to be coated and thus affect its performance: in this case you may need to remove and clean the sensor. Some ‘Direct’ TPMS have small-bore valves that will not allow regular sealant to enter. OKO recommends that you consult your vehicle manufacturer to check whether their internal TPMS system is sealant-friendly before fitting anti-puncture sealant – and external ‘Indirect’ TPMS, that measure the speed of each wheel/tyre and use regular valves, are of course always OKO-compatible.

There is no legal reason under UK, EU or USA law that should allow a Tyre manufacturer to say that their warranties are void due to the use of OKO Tyre Sealant, whether Off Road or On Road OKO. We hold copies of statements from major commercial tyre manufacturers stating that the fitting of tyre sealant does not void their warranties. Since the inception of OKO, there has been no report that OKO has caused a new tyre warranty rejection or a retread casing rejection. All OKO formulations are harmless to tyres, rubber and other tyre components. It is possible that on rare occasions a retail tyre distributor may take a negative stance against OKO. This is likely due to a historic and cultural tradition of being “anti-sealant”, or ignorance of the modern technological information provided by the OKO Group.

By using OKO, it is possible to combat porosity, which is a natural process of air migration through the tyre casing. By eliminating the possibility of driving on under-­inflated tyres, they will remain in effective service for longer periods. OKO will also tend to cool and condition the tyre rubber, retarding dry rot and casing degradation. These effects help to lengthen the life of the tubeless tyre casing. In a 5-month test in matched MAN trucks, an OKO fitted tractor unit had 20% less tyre wear than a non-OKO tractor across all tyres. Steer tyres had 40% less wear, using OKO. In another test with temperature-monitored tyres on a heavy-duty forestry truck, the OKO-equipped tyres were on average 11.5% cooler than the matching non-OKO tyres. Heat is a leading cause of early tyre exhaustion.

No. OKO Puncture Free is compatible with retreading methods, both cold and hot cures. OKO does not have adverse effects on tyre casings or metal tyre cords. Tyre casings must be cleaned and dried prior to collection by the Retreading company or before delivery to them. OKO is retread-friendly, easy to clean with water and does not mask the punctures and holes sealed. It should be simple for “NDT” machines to find all the punctures sealed by OKO. OKO sealants have been formulated to be compatible with compounds used within a tyre. The R & D of OKO has been carried out in collaboration with leading scientific research bodies including“TARRC”, a leading Tyre & Rubber Research Institution (formerly M.R.P.R.A., a research institution owned jointly by The Malaysian & British Governments). OKO does not pose any hazards or flammability issues for the Retreading companies either.

Unlikely. “Run Flat” tyres are supplied by Tyre Manufacturers for specific new car models and may be considered useful for specific users who are willing to pay more for that particular tyre and special wheel, knowing the combination will only function correctly once. The ride may be adversely affected, compared to regular tyres/rims.

For cars, OKO offers the Get-u-Home™ emergency repair kit that functions on standard tyres and wheels.

Due to the strength of the OKO seal, in normal conditions, it is unlikely that a conventional vulcanised repair is required. If necessary, OKO can be removed from the inside of the tyre by washing it out. The best method is by using a hose. The tyre can be dried. Then, a vulcanised repair can be applied, if necessary.

The OKO seal size varies with the tyre size and type, and the grade of OKO used. Generally, the larger and thicker the tyre, the larger the hole that can be sealed. See the specific product pages for details.

No. Any OKO product is formulated to remain in suspension. It remains ready to stop punctures, always. Generally, sealants that require shaking before use are bad sealants: they will deliver uneven product, and are likely to fall out of suspension again inside the tyre.

Normally, not at all. OKO’s water-based sealants are designed in normal use to last the legal life of a tyre. In high-mileage on-road truck tyres it normally lasts for 62,000 miles + / 100,000 km + and the dosage may then need to be topped up: it depends on the conditions, whether new or remould tyres are used and how the vehicle is driven. OKO Magic Milk™, like all latex tubeless bike sealants, will dry out: but slower than others, and it dries evenly so it can be topped up without removing the tyre, until the tyre is worn out.

OKO has sealed a Quad tyre at 2.5 psi (0.15 bar). It has sealed a Truck tyre at 145 psi (10.0 bar). There is little practical limit on the high side.

OKO is designed to seal many holes. It is the true “Multi-sealing” tyre puncture sealant. A small amount of OKO is used to seal a single hole in the tyre casing. Most of the tyre sealant remains and carries on working.

According to UK Forensic studies, a nail can penetrate a tyre and on average will remain there for between 60 and 180 miles (96 to 290 km). The nail is likely to eject itself after this period. If OKO is inside the tyre, the vehicle is motionless, and the nail is noticed to be in the tread area:
i. The driver should pull the nail; then, ii. Drive immediately; this will cause OKO to make a new seal. If the nail is unnoticed and ejects itself, as the vehicle is in motion, OKO will make a new seal.

Tyre structures are likely to be weakened by sidewall and “Run Flat” damage. Using OKO will eliminate many if not all of the risks associated with “Run Flat damage” but OKO will not seal sidewall holes.

OKO Group regards the seal to be a permanent seal due to its strength. When subjected to a “strength test” at the Gerotek Military Test Facility, OKO was compared to a “Repair plug” and a “vulcanised repair”. In this case, it was shown that the OKO permanent seal was 1.6 times stronger than a vulcanised repair and 7 times stronger than a “repair plug”. (The tyre industry states that a “Traditional repair” – defined as a vulcanised repair – is permanent. Therefore, the seal made by OKO On Road & Off Road, that is so much stronger, should be regarded by users and consumers as “more permanent still”).

OKO will seal holes in the tread area caused by nails, screws, glass, stones and sharp objects.

The OKO Group uses its best endeavours to formulate products which are as environmentally friendly and as safe to use, store and dispose of as possible. All OKO formulations are audited by “Chemtox” (www.chemtox-trotters.com).
No OKO product is classified as harmful, flammable or combustible, even under the latest worldwide chemical regulations. All are regarded as ‘non-hazardous’. They are all permitted for airline hold transport. MSDS sheets are available on request.

No. OKO remains liquid inside the tyre. It will seal a hole under pressure and then dry instantly, but it will not react with the air inside the tyre and turn hard.

OKO On Road products have been tested at various speeds in a variety of vehicles.
Controlled tests have averaged between 100 & 120 mph (160 to 192 km/h). OKO has been tested satisfactorily in Motorcycles at speeds in excess of 185 mph (300 km/h) on Race Tracks. OKO On Road products are designed for use on the highway to a maximum of 130 km/h or any lower legal speed set by the authorities. DO NOT EXCEED YOUR LEGAL VEHICLE SPEED LIMIT.

No. There are special corrosion inhibitors in the OKO sealant formulations that inhibit corrosion in steel & alloy rims. They will prevent the product from causing oxidation in brass valve stems. If any residue of OKO is touching the inner rim, it can be washed off when a tyre is changed. It is advisable NOT to use any tyre sealant with traditional chrome-plated wheels as they are susceptible to chemical effects.

OKO LifeLong is a free-flowing liquid (not a sealant) that coats wheel rims and the interior of large vehicle tyres – it uses advanced nanotechnology to actually clean and resist rust on rims; as well as cooling and lubricating the tyre rubber, making it easier to mount/dismount and lengthening tyre life by 30% on average. Operators who do not suffer many punctures but who have expensive wheel/tyre replacement costs can save a massive amount.

Performance: OKO does not affect tyre structures or rubber adversely. In most cases the tyre life will be extended by 20%+ (LifeLong: 30%) as OKO cools the tyre and lessens air loss. OKO sealants will also reduce the possibility of tyre life being shortened due to “Run-flat” damage.

Yes, it is both a safe and a legal form of puncture prevention.

OKO can be applied to almost any Pneumatic tyre (see limited exceptions on the relevant Products page).

No. As with any other tyres, drivers should check them regularly for cuts, penetration damage, and a loss of air pressure. Checks should be made at least twice a month, whether it is an Off Road tyre or On Road tyre.

No. OKO washes out easily and tyres that have contained OKO can be disposed of via conventional recycling. OKO Group can recommend the methods required if there is a significant amount of OKO to disperse.

OKO makes several formulations. Unlike many competitors, these are all genuinely different, having been designed and engineered especially for certain vehicle types. Any user of OKO can choose by using this site; or by examining the description on the labels of the bottles and drums.

Yes – with exceptions. OKO will seal holes in the outer casing and in the inner tubes as well, but inner tubes are problematic. They can be unreliable and the wall thickness inconsistent. The inner tube can move inside the tyre. Inner tubes tend to rip when a puncturing object remains. You cannot inspect the tube.
OKO Off Road grades will function and seal holes without or with inner tubes (subject to lower limits in the case of tubes): but if the wheels and tyres permit it, the best combination for most Off & On Road users is to use a Tubeless wheel/tyre combination with OKO applied. This is the less expensive and better performing option for puncture free driving.

OKO On Road grades should ideally be applied to tubeless tyres only, except for speed-limited mopeds/scooters with inner tubes, which can use OKO X-Treme Dirt Bike.

Yes. The amounts to be applied for any given tyre size are shown on the Dosage Calculator on this site; on product labels; and on the OKO application charts, as well as via your dealer/distributor.

Not especially, but common sense needs to be used. Avoid contact with the eyes; avoid prolonged skin contact with the sticky viscous layer inside the tyre; and do not drink the product. OKO can be removed from the skin with soaps and industrial hand cleaners. If OKO gets in the eyes, wash with copious amounts of clean water. Keep OKO out of the reach of children.

When a tyre is deflated on purpose for any reason, it is virtually guaranteed that the vehicle is standing still. When the tyre is motionless the OKO remains in place, coating the inside tread area of the tyre. It does not travel towards the valve stem. Insufficient air pressure and the lack of movement is enough to ensure the OKO remains in its correct place. In the rare event of a blockage, blow the valve stem clean with an air line or poke it through with a thin wire.

No. When applying the OKO product, some residue may remain inside the valve stem. This residue should be cleared by using an air-line as per the instructions. OKO tyre sealant coats the inside of the tyre. It will not travel back up the valve stem. Normally, conditions inside the tyre mean that no air is forced back through the valve stem out to the outside environment.

Tyres filled with water or other liquid. Some rear Tractor tyres are ballasted by farmers to weigh down the vehicle. Or some pack rear tyres with weights or sand. Part-ballasting the tyre with OKO and using axle weights as needed is preferable (for the vehicle and the land) to using water or sand inside tyres; and the puncture problem would be eliminated too. (OKO cannot function inside a tyre that has been filled with water). For full information, see our Blog

If OKO splashes on clothes, it should be wiped off immediately, preferably with a wet cloth. If some OKO residue remains, wash the clothing that evening or during the same day. Avoid leaving the clothes for a long time with the OKO in a dry state. Contact with clothing should be avoided where possible.

Depending on the formulation (determined by the climate of the country concerned and the formulation for that region) – 50 degrees C. to above + 50 degrees C. Both OKO Off Road and On Road grades have been used in vehicles in hot Desert conditions and in the northern Russian winter.
OKO Truck & Bus was tested in fast moving truck tyres over a 500 mile course starting at 6,000 feet above sea level and driving down to sea level, through extreme heat. The trucks repeated the journey until 110,000 Km (68,750 miles) had been driven. Punctures suffered early during this test remained sealed throughout. The holes remained blocked by the permanent OKO seal. After 110,000 km, the product remained effective, sealing further punctures. OKO Truck & Bus remained inside the tyre in liquid form, positioned as designed, effectively coating and protecting the inner tread area of the tyres. The inclusion of a special ingredient within the formulation kept the tyres cooler than normal.

OKO will not cause wheel imbalance in heavy vehicles if the product is dosed correctly. Any temptation to apply more than the recommended dose must be resisted.

When applying On Road Motorcycle to both wheels of a motorcycle as a preventative measure, the instructions should be strictly adhered to. In any vehicles, only the recommended quantity should be inserted, and to all tyres. Having applied the OKO to all 4 wheels of a light vehicle, drive carefully and slowly for a distance of 4 km (approx. 3 miles).
During this initial “run in” distance, OKO will line the inner tread area of the tyre. Once this inner coat has been formed, there should normally be no wheel imbalance.

When applying the OKO Get-u-Home™ compressor/sealant or Light On Road sealant to temporarily repair a car’s flat tyre, there will be imbalance with the other wheels, hence the need to drive at less than 50 mph/ 80 km/h.

OKO Off Road should NOT be fitted to fast moving On Road vehicles, or driven at a speed regularly exceeding 80 km/h (50 mph).

Generally, once the OKO has coated the inner tyre, the majority of the OKO will remain as a coating. If an On Road light vehicle has been idle for a long period some minor wheel vibration may be detected when first starting off. This will disappear rapidly if the vehicle is driven steadily. This issue is NOT relevant to the use of Off Road OKO grades; OKO for Bicycles; or On Road OKO for Truck & Bus use.