Common Issues & Solutions in Thermoplastic Road Marking Application
Thermoplastic road marking paint (hot-melt marking paint) is vital for traffic safety, but improper application can lead to defects. Here’s a breakdown of frequent problems and how to fix them:
1. Surface Defects
Bubbles/Pinholes:Caused by moisture in road pores, wet pavement, or trapped air expanding under hot paint. Solution: Dry pavement thoroughly before application; avoid rainy/humid conditions. Use fast-drying primers and ensure substrate temperature >5°C .
Streaks/Scratches:Result from contaminated paint (burnt residue, debris) or uneven nozzle flow. Solution: Clean filters and kettles regularly; maintain paint temperature at 180–220°C to prevent scorching .
2. Adhesion Failures
Peeling/Flaking:Triggered by poor surface prep (dust, oil, moisture), inadequate primer, or low application temperatures (<180°C). Solution: Clean roads rigorously; apply penetrating primers on concrete; ensure paint temperature >180°C at contact .
Cracking:Reflective cracksfrom roadbed movement; thermal cracksdue to rapid cooling in cold weather. Solution: Avoid winter application; use flexible additives in thermoplastic mixes; allow new asphalt to cure for 2+ weeks .
3. Poor Night Visibility
Weak Reflectivity:Caused by uneven glass bead distribution, low-quality beads, or wind during application. Solution: Use high-purity beads (≥70% roundness); install windshields on bead dispensers; apply beads at 0.3–0.4 kg/m² density .
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