The substrate must be stiff, clean, and capable of bearing the load. Particularly dense and smooth substrates that are not capable of bearing the load of the layers (e.g., dirt, old coatings, film-forming material, water-repellent materials, or cement grout) as well as damaged concrete surfaces must be pre-treated with the use of sandblasting or water jetting. The substrate must be rough, i.e., the filler must be clearly visible. The preliminarily treated substrate must be dampened for 3 hours. The surface must be damp, but it is necessary to avoid creating puddles. It is necessary to remove all the corrosion products from the concrete substrate as well as from the steel reinforcement bars with the use of a sandblasting unit. For long-term protection against corrosion of reinforcement, as well as improve the adhesion, it is necessary to apply Profscreen LC 2.5 anti-corrosive compound. To do this, the materials are mixed with water to a plastic consistency and applied to a slightly damp substrate with the use of a brush. At the same time, it is necessary to prevent drying the applied layer.
In order to prepare the mortar, the contents of the bag must be poured into a tank with clean water at a rate of 3.75-4 liters of water per 25-kg bag while constantly mixing until a homogeneous mass is obtained. The mortar must be mixed with the use of an industrial-grade mixer. The use of gravity-type mixers for mixing as well as manual mixing are not recommended. The entire bag with the material must be used for mixing. The mortar must be set aside to cure for 3-5 minutes and then re-mixed. Then, the mortar is ready for use. The prepared mortar must be used within 10 minutes. In case of increased viscosity of the mortar in the tank (within the life time of the mortar), it is necessary to remix the mortar without adding water. Do not exceed the required value for the volume of water!!! Only clean capacities, tools, and water must be used for the preparation of the mortar.
The mortar must be manually applied to the prepared surface to a thickness in the range from 5 mm to 50 mm.