Polyurea application Step by Step

Polyurea application Step by Step

Multiple applications exist for continuous our pure polyurea TECNOCOAT P-2049 waterproofing system, the paragraph “ Systems of Application ”details the most frequent, nevertheless in all of them it is necessary to bear in mind a series of technical aspects so that the final result is ideal. Next we will describe the correct way of realizing a standard application.

1. Support

The substrate should be consistent and have a tensile strength of 20 ~ 25N/mm2 (HA-20 ~ HA-25), as our membranes have adhesion strengths of up to 1.85 N/mm2. If you are not certain of the strength you should inspect the substrate and, where possible, carry out tests to determine the tensile strength.

2. Support Preparation

If there is a weak layer of cement on the substrate or it has an uneven surface you should prepare it mechanically (milling, sanding, shot-blasting).
If there are any cracks or small holes they should be filled in and compacted with the appropriate filling, made using our PRIMER EP-1020 product which is very hard and fast drying.
Specific areas, such as structural joints and perimeter flashings with walls, should be prepared using DESMOSEAL MASILLA-PU putty and/or TECNOBAND 100 ask our technical department. When all the preliminary work to prepare the substrate has been completed you should clean the area, clearing away any debris or loose material.

The surface should be cleaned by applying our DILUYENTE TEC-4U solvent to ensure fast evaporation and drying. In the areas with overlaps, or the finishes of mechanical roof elements, we recommend using TECNOBAND 100 and/or DESMOSEAL MASILLA-PU putty to absorb the mechanical loads that are generated in this type of roof (ask our technical department).
Please contact Tecnopol Sistemas´ technical department if you have any queries about other types of substrate (fiber cement, wood, asphalt, ...).

3. Primer

You should also apply one of our primers (see table a) to increase adhesion to the substrate and achieve a correct surface finish. It can be applied by brush, roller or an airless spray.
In the case of concrete surfaces, the concrete should have completed the 28-day curing process after casting. You should also check that the degree of moisture in the surface of the substrate does not exceed the maximum allowable level of the product.

  • Porous (concrete): PRIMER PUc-1050 / PRIMER PUc-1050
  • Not porous (metal, ceramics, plates, asphalt, wood...): PRIMER EPw-1070

4. Tecnocoat P-2049 Membrane

Apply TECNOCOAT P-2049 in a uniform way with a high-pressure sprayer (Reactor E-XP2), which can mix the two components at a pressure of 2.700 psi at 75 °C.

5. Top Coat (optional)

After the TECNOCOAT P-2049 membrane has been applied a protective coat of TECNOTOP aliphatic polyurethane varnish (see table b) should be applied within 48 hours, to ensure the stability of the desired colour when there is no additional protection. TECNOTOP is also good for surfaces with heavy vehicle traffic, and essential for non-slip finishes and waterproofing swimming pools, aquariums, water tanks etc...

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