Polyurea Coating in Hot or Cold Spraying

Polyurea Coating in Hot or Cold Spraying

The heated polyurea system as a sealing membrane for many types of surfaces and bases has become the prime choice sealing designers and consultants.

Polyurea has a range of unique features that provides the customer with a relative advantage, as follows:

The application technique of a heated polyurea system is based on the reaction of part A and part B when they are joined at the spray nozzle at an average temperature of 60-70 degrees Celsius. The reaction during the spraying gives the material its properties and its rapid drying ability. Polyurea application requires use of, and certification for, airless piston dual head sprayer with spray gun with redundant double feed.
In view of our company’s many years of experience in the application of polyurea sealing systems, we hold that in spite of its many advantages, it requires meticulous, rigorous surface preparation prior to application. It may be said that the process of preparing the surface is the most important when in the implementing of the polyurea system. In porous concrete bases, the spray temperature may cause hot pinholes at curing and thus the membrane impermeability may be compromised. Therefore, the surface preparation will include smoothing and sealing the surface prior to application.

Basic Procedure for the Application of Heated Polyurea System:

  1. Examination of the existing infrastructure, including: Examination of the existing base — pull out test for thickness assessment, measurement of roughness, humidity and ambient temperature
  2. Concrete rehabilitation as required
  3. Roughening the concrete or metal surface
  4. In concrete bases, preliminary surface smoothing based on epoxy filer or epoxy cement
  5. Application of an epoxy primer designated for concrete or metal bases
  6. Application of the polyurea system at the required thickness (usually 1.5-2 mm)