Preliminary Measures

The operation of installing FKR sealant in tyres and other pneumatic chambers is done by instructed personnel in the tyre operting units.

Tyre inspection

Before installing FKR, it is recommended to inspect the tyre to observe if:

  • There are any eventual traces of premature aging, stress, excessive mechanical aggressions (cuts in the tread profile);
  • The thread profile depth is under the approved legal limit (there is no profile above the tyre’s usage indicators);
  • There exist traces of hits on the tyre sidewalls, accompanied usually by the thinning of the cord cables of the housing (presence of radial bumps on the tyre sidewalls);
  • The rim is deformed, proceeding to its reparation;

Iinside the tyre there is rubber powder (resulted from the process of degradation of the sealing layer), talcum, water, oil, all these foreign elements are eliminated and the tyre is washed and dried;

  • The rim presents signs of accentuated corosion (oxidated metal surface).

Following inspection, if the tyres are considered adequate (none of the above situations are present), it is time to proceed to installing the FKR sealant.

It is not recommended to install FKR sealant in aged tyres (used over the normal lifespan stated by the tyre’s manufacturer). FKR acts in elastic chambers.

Equipment, tools, devices used

  • The sealant installation pump;
  • Mechanical valve to extract the valve cap, screwdriver;
  • Air compressor equipped with a filter;
  • Pressure gauge.

How to install

FKR is installed quickly and easily through the valve by using a manual pump (the professional use version). Time needed for installing is only a few minutes per tyre.
Instructions for use are contained in the Installation manual, made available by the Producer on delivery.

Installation instructions for professional
Installation instructions for using the bootle

Installation Pump

For inserting the FKR sealant in the tyre, a manual aluminum pump with a transparent PVC hose is used. The pump is calib

rated in 8 units:




After use it is recommended to clean the pump as described below, in order to prevent any blockages to form due to the consolidation of fibers, fact that would prevent the free flow of sealant. Contrarily, the fiber congestion could be pushed in the pump, blocking it.

  • Take out the pump from the container and place it in a bucket of water;
  • Trigger the handle several times;
  • Take the pump out of the water and continue pumping until complete elimination of water.
  • When emptying a container and the pump is immediately transferred to another, cleaning the pump is not necessary.


If the pump is mounted on a container, but the pump isn’t used for a longer period of time, then the above cleaning procedure should be done.

Solving Special Cases

Using the FKR sealant is simple. What you need to do is to insert in the tyre according to instructions. A perforation that occurs while driving, without the object remaining in the tyre, will seal almost instantly and very little air will be lost before the sealing becomes permanent, therefore you won’t even notice a flat had occurred.

FKR is a preventive product, but could also be used after the perforation occurs.

When the product doesn’t work for you anymore, although it is still in its terms of validity, the causes can be:

The tyres must be inspected periodically for removing eventual foreign objects through which the tyre might lose air.


  • Find the spot through which the tyre loses air by visualization, feeling or wetting the tyre;
  • Mark the spot visibly (with chalk or paint);

The existence of the object in the tyre will not allow the sealant to form a permanent filling. Do not remove the object from the tyre!

  • Restore the pressure (eventually ensure an overpressure of 0.5 atm);
  • Drive for a small distance to allow the solution to distribute uniformly;
  • To remove the object, position the tyre with the marked spot (perforation) facing downwards, but allowing it to be removed afterwards (extracting the perforating object);
  • Remove the object and drive immediately such that the sealant will fill the hole and the cap is formed (a temporary seal is formed); if a screw is stuck in the tyre, remove it by unscrewing it; forcing its extraction might affect the tyre;
  • Restore the normal pressure;
  • As the tyre continues to run subsequently, the flexion action pushes additional sealant in the perforation, making the seal permanent.


  • A perforating object located inside the tyre for a longer period of time could could cause difficulties in sealing once it is removed, because of the tyre’s rubber losing elasticity, which leads to the tyre taking the shape of the perforating object. As a result of the loss of elasticity, when the object is removed, an open hole remains. This is why it is very important to regularly check for perforating objects inside the tyre.

To help the sealing of such a perforation, pressure should be restored (eventually ensuring an overpressure of 0.5 atm), making the wheel run for 8-10 km, until the tyre is heated. This would help in regaining its elasticity. Remove the perforating object and drive immediately, or the tyre could lose pressure and the perforation might not be sealed accordingly. The tyre must be inflated again to avoid driving with a deflated tyre.Pentru a ajuta etanşarea unei astfel de perforări se reface presiunea ( eventual asigurând 0,5 atm suprapresiune), se rulează 8-10 km până când anvelopa se încălzeşte.

The process of inflating/driving is necessarily repeated up to three times in this case (object stuck in the tyre for a long time), so that the seal becomes permanent.

  • Before removing the perforating object, the tyre should be inflated at a slight overpressure, because in a deflated tyre, the sealant has the tendency to migrate sideways, not reaching the perforation as it should. The pressure also helps in sending the optimal quantity of sealant in the perforation.


The inspection and extraction operation is recommended to be done at the end of a ride, as the higher temperature when riding recovers the rubber’s elasticity and implicitly repairing the tyre by using FKR..

Extracting of perforating objects should not be done, therefore, if the vehicle was stationed for a while (before beginning a ride).

The presence of foreign substances in the tyre, such as water (the air source was not equipped with a water retention filter), rust (coming from an excessively corroded rim), oils or fats, can lead to underperformance, such as the following:
– the presence of water can lead to the loss of FKR stability, because of the centrifugal separation of components while riding; the air source should be equipped with a water retention filter;
– installing FKR in a wheel with an excessively corroded rim can lead to the alteration of the product (changing the color to dark brown and modifying the viscosity). FKR contains corrosion inhibitors which protect the metal surface against corrosion, also preventing the from the spread of it, if it exists. However, if the initial corrosion of the rim is excessive, it will consume the corrosion inhibitors, and so their protection capacity will be diminished. This is why it is recommended that FKR should be installed in tyres with rims without initial corrosion, such that the corrosion inhibitors do their job during the sealant’s lifespan.
– the presence of fats and oils in the tyre might lead to the expulsion of the filling cap out of the perforation.
For a better control of the interior of the tyre, we recommend installing FKR at the first equipping (when mounting the tyre on the rim).

In the situation that the tyre has an insufficient quantity of FKR left in the tyre, the product getting consumed through successive sealings, it is possible that the last sealing might not be permanent, due to the low quantity of solution in the perforation and the tyre might start losing air.
What to do if this happens?
– spray water on the exterior surface of the tyre, locating where it is losing air;
– mark the spot;
– gently clean with a wet cloth the sealant previously installed in the tyre;
– restore pressure;
– insert a new quantity of sealant according to the recommended dosages;
– using a sharp object remove the partially formed filling cap, then ride for a permanent seal.
When establishing the dosages, the frequency of flat occurrence per type of vehicle was also considered, such that they are sufficient for ensuring the flat tyre protection for the entire standardized lifespan of the tyre.

The high porosity of the tyre could represent another factor for air losses. Due to the diverse locations of porosity, a longer ride would be needed until the sealant eliminates all the leakages due to porosity. If the porosity persists, increase pressure by 10-15% (do not exceed the maximum recommended by the tyre’s manufacturer) and ride the vehicle for 2 days, then reduce the pressure at the normal level. By increasing the pressure, the pores will open and allow FKR to be forced in the troubled areas, eliminating the porosity.

If the tyre was perforated by large objects (above the accepted diameter limit), action which lead to damaging the cord structure, subsequent sealing is not permanent, the tyre must be inspected and repaired by a specialist. Having FKR in the tyres, however, will prevent the instant deflation by partially closing the perforation, allowing STOPPING IN SAFE CONDITIONS.


In the case of large flats which appear on the shoulder or sides of the tyre, which can’t be repaired by FKR sealant, the chamber or tyre can be vulcanized as usual, after cleaning the interior of tyre, the presence of the product not affecting the reparation operation.
How to repair a tubeless tyre equipped with FKR?
Unmount the tyre and wipe off the FKR from the damaged area with a wet cloth, proceeding afterwards with its usual reparation. In the case that the reparation (including unmounting and mounting) is finalized in 2 hours, it is not needed to totally remove FKR. When mounting the tyre again, add an additional quantity of FKR to compensate for the quantity removed when the reparation was done.

How to repair a tubed tyre equipped with FKR?

Tubed tyres can be repaired easily. FKR will not cause any problems, simply spread the chamber on a working space and remove FKR from the damaged area by applying pressure with the finger. Wipe off with a wet cloth, dry the chamber and proceed to usual reparation. Respect the vulcanization temperature.