Polyurea applications, offers superior waterproofing, coating and surface protection advantages in industrial projects. However, there are critical details that need to be considered before, during and after application to achieve the desired performance. In this comprehensive guide, polyurea coating You can find all the important points you need to know in our applications.

Why is Surface Preparation Important?

The success of polyurea waterproofing applications depends on surface preparation.

Cleaning: The surface must be completely cleared of dust, oil, moisture, dirt, rust and mold residue.
Roughening: Concrete surfaces should be shot blasted or ground to increase adhesion.
Dryness: The application surface must be dry, the surface moisture must be below %4.

Environmental Conditions During Application

Heat: It should be between +5°C and +40°C.
Relative humidity: %85’in altında olmalı.
Dew Point: The surface temperature must be at least +3°C higher than the dew point temperature.

Equipment Selection and Application Details

Polyurea coatingis applied by spraying with high-pressure, high-temperature plural component spray machines (e.g. Graco Reactor).
Mixing Ratio: It is usually 1:1 and precise measurement is provided on automatic machines.
Practitioner Experience: Since the application time is measured in seconds, experienced personnel is essential.

Application Thickness Control

• Typical application thickness: 2–3 mm.

• A certain thickness should not be exceeded in a single coat application.

• The thickness should be homogeneous and there should be no thin or thick spots.

Extra Attention Required in Roof Polyurea Applications

Roofs are constantly exposed to UV and climate changes in the outdoor environment. For this reason, polyurea waterproofing applications require extra attention.

Roughening:

• Metal roofs: Lightly sand or blast.

• Concrete roofs: Grinding or milling required.

Primer Usage:

• Polyurea will not adhere directly to most surfaces. A suitable primer (e.g. epoxy based primer) should be applied.

• Polyurea should not be applied before the primer is fully cured.

Weather Conditions:

• The risk of condensation is high in the morning hours.

• Wind may cause spray to splash onto unwanted surfaces.

Polyurea Application on Detail Points

• Brushes or short spray tips should be used on details such as chimney bases, drains, and parapets.

• If necessary, mesh reinforcement should be made at joints and corners.

• If continuity is not ensured, waterproofness will be impaired.

UV Resistance in Polyurea Coatings

• Aromatic polyurea is not UV resistant; colour fading may occur in the sun.

• For long-term UV resistance, aliphatic polyurea or aliphatic polyurethane top coat should be applied.

Application Security and Final Checks

• All team members must wear masks, safety glasses, coveralls, and gloves.

• Barriers should be installed in the environment against the risk of splashing.

• After application, thickness measurement and pull-off adhesion tests may be required.

Polyurea vs Liquid Membrane Comparison

When Should Which System Be Preferred?

• Industrial roof, parking lot, water tank: Polyurea

• Small terrace, balcony, basic curtain: Liquid Membrane

• High performance and fast curing: Polyurea

• Economical, low-traffic areas: Liquid Membrane

Result: Professional Solutions for Success in Polyurea Application

Polyurea applications, requires correct surface preparation, suitable primer, professional equipment and expert team. Sempoly offers long-lasting solutions to your projects with its high-performance polyurea coating and waterproofing products.

👉 If you want to get more information and choose the most suitable polyurea solution for your project Contact Sempoly, our experts will be happy to support you.