Special cases solving

Using FKR is simple. You just have to insert it inside the tyre according to the instructions. A puncture that occurs during driving (without the remaining of the perforating object inside the tyre), shall be sealed almost instantaneously and only a small quantity of air shall be lost before the seal becomes permanent. Thus you will not even notice that a flat happened.

FKR is first of all a product that prevents, but that can be used even after the event (puncture) has taken place.

When the product no longer works for you in its normal lifetime, one of the causes may be:

a) Perforating object remained in the tyre:

The tyres need to be periodically inspected to remove the eventual external objects through where the tyre could lose air.


  • Find the place through where the tyre loses air by visualizing, touching or splashing the wheel with water;
  • Mark in a visible manner (with chalk or paint) the place where the object is (nail/wire/screw);

Its existence inside the tyre shall not permit to form a permanent plug.


  • Readjust the pressure (eventual insure 0.5 bar Overpressure);
  • Drive for a small distance in order to allow the liquid to be evenly distributed;
  • In order to remove the nail, locate the tyre with marked area (puncture) on the bottom side, sufficient enough so that it allows subsequent operation (extraction of the perforating object);
    • Remove the nail and drive immediately, so that the liquid covers and obstructs the hole and forms a plug (seal) and thereby a temporary seal is formed;
    • Readjust the normal pressure.
    • As the tyre continues to rotate, flexion action triggers the supplementary material to enter the puncture and thus the seal becomes permanent.


  • A perforating object located in the tyre for a longer period of time could cause difficulties in sealing process once it is removed, because the rubber has lost elasticity and that may implicitly lead to deformation of the shape. As a result of losing elasticity, when the object is removed an open hole is left. This is one of the reasons why it is very important to regularly check the existence of strange objects in the tyre. In order to help to seal such a puncture, the pressure is readjust (eventually insuring 0.5 bar overpressure); one should drive 8 -10 km until the tyre heats. This will help to recover it’s elasticity . The perforating object is removed and one should drive immediately, otherwise the tyre may lose pressure and the puncture may not be sealed accordingly. The tyre must be inflated as long as it takes in order to avoid driving with deflated tyre. In this situation the process of re-inflation is needed to be repeated for 3 times (an object has been kept inside the tyre for a long time), so that the seal becomes permanent.
  • Before removing the perforating object, the tyre must be slightly inflated with overpressure because inside the deflated tyre the liquid tends to migrate sideways and thus it does not reach correspondingly to the puncture when in motion, and at the same time the pressure fosters the entrance of the optimal quantity of material inside the puncture.


The inspection and extraction procedure of tyre perforating objects is indicated to be performed after the vehicle has been driven (at the end of a trip), since the temperature triggered by motion favors the elasticity of the rubber and thus fixing the tyre is possible by using FKR.

b) The presence of strange substances inside the tyre

The presence of strange substances inside the tyres  such as water (due to an unfiltered air source), rust ( due to an initial rim that was excesivelly corroded),  oils or fats, may lead to non-performances like the ones below:

-water presence may lead to lack of FKR stability, through centrifugal separation of components while in motion ;

– Installing FKR in a tyre with an excesivelly corroded rim may lead to product alteration (change of colour into dark brown and viscosity modification). FKR contain corrosion inhibitors that protects the metallic surface against corrosion, also helping to counter its spread. The initial excesive corrosion of the rim consume the corrosion inhibitors , thus their protection capacity is diminished. This is why FKR installation  is recommended to be done in tyres with rims without traces of initial corrosion, thus the corrosion inhibitors to work effectively the entire lifetime of the sealant in tyre.

-in case of fats and oils they may lead to the expulsion of the plug from the perforation;

c) Insufficient quantity inside the tyre

In the situation that  is not a sufficient quantity of FKR inside the tyre related to the initial quantity, due to successive seals, it is possible that this last seal may not be final because of an insufficient quantity of FKR and the tyre may lose air.

How do we procede in this case?

-we spray water  to locate the place through where the tyre looses air;

-we mark the respective area;

-we easily clean with a wet towel the previous sealant that has been inserted inside the tyre, left in an insufficient quantity to form a continuous film;

– we readjust the pressure;

-we insert a new corresponding quantity of sealant according to recommended dosages;

-with the help of a sharp object we remove the partially formed plug and then we drive immediately to complete the setting of the seal.

At dosage establishment, was also taken into consideration the frequency of flats, on category of vehicles thus the Dosages established by the Manufacturer are sufficient to ensure protection on the entire lifetime of the tyre.

d) High porosity of the tyre

High porosity represents another factor of air loss. Due to various porosity locations, it will require a prolonged period of use by the time the sealant removes those leaks caused by porosity problems. If porosity persists, you have to increase pressure by 10 to 15 % (do not exceed the maximum recommended by the tyre producer) and drive the vehicle during 2 days, then reduce the pressure to its normal standards. By increasing pressure the leaks shall open and thus FKR shall be forced inside the troubled areas, eliminating porosity.

e) Perforation with large objects

If a perforation of the tyre with large perforating objects has occured, which lead to damaging the cord structure, the subsequent sealing is not final, the tyre must be inspected and repaired by a specialist. FKR presence in tyres will impede sudden deflation, through partial seal of the perforation, thus allowing STOPPAGE IN SAFE CONDITIONS.


In case of more serious flats, or ones that occurs on the crown or sidewalls, not being able to be fixed by FKR, the tube/tubeless tyre may be classically vulcanized, after previous cleaning of tyre interior, as the presence of product inside the tyre does not affect the recuperation operation.

How to fix a tubeless tyre that has been treated with FKR?

Separate the tyre and remove FKR out of the affected area with a wet squeezed towel; then you have to proceed at fixing it in normal conditions. If the repair (including dismantling and installation) is finalized in 2 hours, total FKR removal is not necessary. At tyre installation, by approximating the sealant quantity that was lost/ removed, you may add a supplementary quantity of FKR that may compensate the affected quantity of the punctured area or the one that has been removed in the scope of repair operation.

How to fix a tube tyre that has been treated with FKR?

The tyres with tube can be easily fixed. FKR shall not be a problem, you just have to lay the tube on a work surface and remove FKR out of the affected area applying pressure with the finger. Then you can clean with a wet squeezed towel, dry the tube and proceed to normal repair. You have to respect the vulcanization temperature.