Problem: Moisture on wet road surfaces evaporates when heated, causing bubbles in the paint layer.
Solution: Ensure the road surface is completely dry before applying road marking paint, especially during early mornings, evenings in winter, or rainy seasons. Use a moisture detector to confirm the surface meets application requirements.
Problem: Newly paved cement or asphalt surfaces may have porous structures, leading to air expansion and bubbles during paint application.
Solution: Allow newly paved surfaces to dry thoroughly. For cement surfaces, apply a primer to fill pores and reduce bubble formation.
Problem: High temperatures cause air in road cracks to expand, forming bubbles; low temperatures affect paint flowability, making it difficult for bubbles to escape.
Solution: Adjust the paint temperature: lower it to increase viscosity and prevent bubbles from rising, or raise it to improve flowability and allow bubbles to escape. Use an infrared thermometer to monitor and maintain the optimal temperature range of 180-220℃.
Problem: Localized areas may develop bubbles due to environmental factors or improper application.
Solution: Use tape or other coverings to temporarily protect bubbled areas and prevent further expansion. For minor bubbles, gently flatten them with specialized tools to ensure a smooth surface.
Problem: Severe bubble issues may compromise the quality and appearance of the markings.
Solution: Remove the affected paint completely and reapply. Before reapplying, address the root causes, such as surface moisture or temperature control.
Bubble issues in thermoplastic road marking paint application can be effectively resolved through proper methods and measures. Key factors include controlling surface moisture, application temperature, and paint flowability. By adopting scientific techniques and strict quality control, you can ensure the durability and aesthetics of road markings while minimizing bubble formation.
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