OKO has been made since 1978. It is the original modern tire sealant.

There are different product formulations of OKO for any pneumatic tire (we do not sell OKO for preventative use in cars).

There are numerous variables that affect the sealing ability, i.e., location of puncture on the tire, number of ply’s, tire tread thickness and type of object puncturing the tire.  Generally, 95% of all tubeless tires and 75% of tubed will seal with the correct formulation.  Our Magic Milk is designed for tubeless bike tires, providing an improved success rate than with tubes. Puncture Free Bike is for users with tubed tires.

Yes, it is both safe and legal.

Performance – No. OKO does not affect tire structures or rubber. In most cases tire life is extended as OKO keeps air inside, and cools, the tire. OKO also increases tire life by sealing punctures and avoiding run-flat damage.

No. All OKO formulations includes special corrosion inhibitors that inhibit rust in steel and aluminum rims and prevent the oxidizing of brass valve stems. Unlike other products, whose corrosion inhibitors last only two years, ours may (and normally will) last the life of the tire. If any residue of OKO touches the inner rim, it can be washed off when a tire is changed. Other brands may be more prone to damaging your rims in tubeless tires. DO NOT use any tire sealant with traditional chrome-plated rims as they are damaged by most chemicals.

OKO On Road products have been tested at various speeds in a variety of vehicles, including motorcycle tests on racetracks. OKO On Road sealants are designed
for use on the highway to a maximum of 80 mph or any lower legal speed set by the authorities. DO NOT EXCEED YOUR LEGAL VEHICLE SPEED LIMIT.

No. OKO remains liquid inside the tire. It will seal a hole under pressure and then dry instantly there, but the remainder of the liquid will not turn hard.

The OKO Group formulates products that are as environmentally friendly and as safe to use, store and dispose of as possible. No OKO product is classified ‘hazardous’, harmful, or flammable.

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

OKO Group regards the seal to be permanent, due to its strength. When subjected to a “strength test” at the Gerotek Test Facility, OKO was compared to a “repair plug” and a “vulcanized repair”. It was shown that the OKO permanent seal was 1.6 times stronger than a vulcanized repair and 7 times stronger than a “repair plug”. (The tire industry states that a “Traditional Repair” – defined as a vulcanized repair – is permanent. Therefore, the seal made by OKO, that is so much stronger, should be regarded as “more permanent still”).

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

According to Forensic studies, a nail can penetrate a tire and on average will remain there for 60 to 180 miles. The nail is likely to eject itself after this period. If OKO is inside the tire, the vehicle is motionless, and the nail is seen in the tread area:

  1. The driver should pull the nail; AND,
  2. 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.

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

OKO has sealed a Quad tire at 2.5 PSI and has sealed a Truck tire at 145 PSI designed to last (in normal use) the legal life of the tire. There is little practical limit on the high side.

Not at all in Off Road vehicles; OKO is designed in normal use to last (in normal use) the legal life of a tire. In high-mileage on-road truck tires it normally lasts for up 100,000 miles. If the tire is still legal, you can top up with another OKO dose.

No. OKO remains liquid, in suspension, for its designed life span – ready to stop punctures.

The OKO seal size varies with the tire type and size, and the grade of OKO. See the product data sheets and www.okotiresealants.com for details.

This is likely to be extremely rare. Due to the strength of the OKO seal, in normal conditions, it is unlikely that a conventional vulcanized repair will be required. If necessary, OKO can be removed from the inside of the tire by washing it out – ideally using a hose. The tire can be dried, then a vulcanized repair can be made.

Generally, once the OKO has coated the inner tire, the majority of the OKO will remain as a coating. If a light On Road 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 any Off Road OKO; OKO Bike products; or OKO Truck & Bus Heavy On Road for Heavy Trucks and Coaches.

OKO will not cause wheel imbalance if the product is prepared and dosed correctly. When applying On Road OKO to a Motorcycle or light commercial vehicle, the instructions should be strictly adhered to. Wheels of vehicles of 5 tons or lower should be balanced prior to fitting OKO. Only the recommended quantity should be inserted (no more). All tires must be treated. Having applied the OKO, these vehicles should be driven carefully and slowly for a distance of 6 to 10 miles.

During this initial “run in” distance, OKO will line the inner tread area of the tire. Once this inner coat has been formed, there should be no wheel imbalance. In some cases, where initial wheel vibration is experienced at certain speeds, the vehicle must be driven slowly until vibration disappears. OKO Off Road must NOT be fitted to fast moving On Road vehicles or driven regularly at a speed exceeding 50 mph.

From –40 degrees F. (specially made for cold climates) to above + 120 degrees F. Both OKO Off Road and On Road products have been used in hot Desert conditions and in Antarctica.

Tires filled with water. Some rear Tractor tires are ballasted by farmers to weigh down the vehicle. Or some pack rear tires with weights or sand. Fitting the tire with OKO (and using axle weights) is preferable: the puncture problem is eliminated; the tractor performs better, and the ground is not as heavily compacted. (OKO cannot function inside a tire that has been filled with water).

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. Wherever possible, contact with clothing should be avoided.

No. When applying the OKO product, some residue may remain inside the valve stem. Clear this using an airline as per the instructions. OKO sealant coats the inside of the tire. It should not travel back up the valve stem. Normally, conditions inside the tire mean that no air is forced back through the valve stem to the outside.

When a tire is deflated on purpose, it is virtually guaranteed that the vehicle is standing still. In a motionless tire the OKO remains in place, coating the inside tread area of the tire. 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.

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 tire; 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 large amounts of clean water.

Yes. The amounts to be applied for any given tire size are shown on the labels; the Dosage Calculator ; and the OKO application charts.

Mostly, yes. OKO will seal holes in the tire casing and in the inner tubes as well. Most bicycles have inner tubes. But for other vehicles, there are reservations. “Why use an inner tube if applying OKO (assuming the wheel rim permits tubeless tires)?”

Inner tubes are weak. It is not possible to inspect them in use. They can be unreliable and the wall thickness inconsistent. The inner tube can move inside the tire. Tubes tend to rip when a puncturing object remains.

OKO will function and seal holes without or with inner tubes, but the best combination for most vehicles (where the wheel rim is suitable) is to use a tubeless tire with OKO applied. This is the least expensive and best performing option. Exceptions: On road OKO Truck & Bus and On Road Motorcycle are recommended for tubeless tires only.

The OKO Group makes several different formulations. These are designed and engineered especially for certain vehicle types. You can choose the right grade of OKO via okotiresealants.com or by examining the product description on the labels of the different bottles and drums. Only use the correct formulation.

No. Tires with OKO can be disposed of via conventional recycling. OKO Group can recommend the methods required if there is a significant amount of liquid OKO, ideally absorbed into solid waste such as sawdust.

No. OKO Puncture Free is compatible with retreading methods, cold and hot cures. OKO does not have adverse effects on tire casings or metal tire cords. It is recommended that tire casings are cleaned and dried prior to treatment by the retreading company. OKO is easy to clean with water and does not mask the punctures and holes it has sealed. It should be simple for “NDT” machines to find all the punctures sealed by OKO. The R & D of OKO has been carried out in collaboration with “Rubber Consultants”, a leading Tire & 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 retreading companies.

By using OKO, it is possible to combat some porosity, the natural process of air migration through the tire casing. By reducing the possibility of driving on under– inflated tires, they will likely remain in use for longer. Under-inflation causes a heat build-up, and heat is the biggest enemy of tire life. OKO also tends to retard dry rot and casing degradation. This all helps lengthen the life of the tubeless tire.

There is no legal reason under USA law that allows a tire manufacturer to say that its warranties are void due to the use of OKO Tire Sealant. Since the founding of OKO, there has been no report that OKO has caused a new tire warranty rejection or a retread casing rejection. All OKO formulations are harmless to tires and rubber and are compatible with tire components.

It is possible that a retail tire distributor may take a negative stance against OKO. This is likely due to a historic and cultural tradition of being ‘anti-sealant’ or ignorant of the modern technological information provided by OKO Group.

Tire sealant runs around the inside of the tire tread. Thus, in most instances it should not come into contact with an internal-type TPMS (Tire Pressure Monitoring System) valve sensor when in use. However, when fitting OKO you may cause the sensor to be coated (or it may be splashed when in use), affecting its performance. Some TPMS valves are also too narrow in diameter to accept sealant. External-type TPMS that monitors the shape

of the tire is fully compatible with OKO. We recommend that you consult your vehicle manufacturer to check whether the TPMS system is sealant-friendly before fitting anti-puncture sealant.

The standard instructions (shown also on the animated 3D drum video) are to wash the pump through by pumping water into a bucket until the water runs clear. The same procedure can apply if the pump is getting blocked. I would say that it’s a rare problem but if it does happen, this can work to unblock the flow.


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All puncture sealants are NOT created equal. Choose OKO.