Recommendations for Polyurea Application in Humid Seasons

Polyurea spraying requires strict application procedures. For example, the substrate temperature should be at least 3°C higher than the dew point temperature; ambient humidity should not exceed 80%; the moisture content of a concrete substrate should be below 8%; and the surface roughness of a metal substrate should reach the Sa2.5 standard before application. The B-component should be well stirred, the A-component properly sealed, and the equipment should be equipped with an air dryer or oil-water separator.

However, in real-world construction, many of these details are often overlooked. While minor neglect might not immediately cause issues, problems can appear unexpectedly. For instance, even when using the same material, adhesion issues may suddenly occur. This is often due to recent increases in ambient temperature and humidity across many regions. Since many workers do not test dew point conditions before spraying, condensation may form on the substrate surface, creating a thin water film that leads to adhesion failure and other coating defects.

Therefore, it is essential to study and master proper polyurea construction techniques, follow standardized application procedures, and ensure optimal environmental conditions to guarantee coating quality and long-term performance.

Qingdao Polyswell is focusing on the research and development, production and sales of polyurea technology. We will always hold your back. If you have any questions about polyurea technology, please feel free to contact us.

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Key Words:  polyurea application