Why Do Thermoplastic Road Marking Lines Crack? Common Causes and Practical Solutions for Philippine Roads

Thermoplastic road marking paint is widely used on highways, city roads, industrial parks, airports, and parking areas across the Philippines because of its excellent visibility, fast drying, durability, and long service life.

However, some contractors notice that road markings begin to crack several months after installation. Cracked markings reduce nighttime visibility, increase maintenance costs, and may affect road safety.

So why do thermoplastic road markings crack, and how can these problems be prevented?

This article explains the common causes based on typical construction conditions in the Philippines.

Many Philippine roads are asphalt pavements exposed to heavy traffic, high temperatures, and seasonal rainfall. Existing pavement cracks, loose surfaces, or poor cleaning before application may transfer stress to the thermoplastic layer, eventually causing cracks.

Before application, contractors should ensure that the pavement is clean, dry, and free from dust, oil, and loose materials. Damaged pavement should be repaired before marking.

Thermoplastic road marking paint should always be heated according to the manufacturer's recommended temperature range.

If the temperature is too low, the material may not melt completely, resulting in poor flow and weak bonding.

Excessive heating may accelerate resin aging and reduce the coating's flexibility, making cracking more likely over time.

Using a reliable hydraulic preheater with accurate temperature control helps maintain consistent material performance.

The quality of thermoplastic paint plays a significant role in long-term durability.

High-quality products generally use stable hydrocarbon resin, carefully selected fillers, quality pigments, and compatible glass beads to improve:

• Wear resistance
• UV resistance
• Adhesion
• Flexibility
• Weather resistance

These properties are especially important under the Philippines' tropical climate with strong sunlight and frequent rainfall.

Glass beads are not only responsible for nighttime retroreflectivity.

Proper bead application also contributes to a more uniform road marking surface. Contractors should use suitable glass beads and follow the recommended application rate specified for each project.

Thicker road markings are not always better.

A coating that is too thin may wear out quickly, while excessive thickness can create internal stress during cooling, increasing the possibility of cracking.

Maintaining a consistent film thickness according to project specifications is recommended.

The Philippines experiences high temperatures, strong UV exposure, high humidity, and seasonal heavy rainfall throughout the year.

Road marking materials should therefore provide excellent weather resistance, strong adhesion, and long-lasting durability.

For government and infrastructure projects, contractors should also select products that meet the technical requirements specified for the project, including applicable DPWH specifications where required.

Contractors can improve long-term performance by following these practices:

• Select high-quality thermoplastic road marking paint.
• Use qualified reflective glass beads.
• Maintain the recommended heating temperature.
• Apply the correct coating thickness.
• Ensure the pavement is clean and dry.
• Use reliable road marking equipment.

Good materials combined with proper construction practices help reduce cracking and extend the service life of road markings.

Guangdong Huaqun Traffic Facilities Co., Ltd. is a professional manufacturer specializing in road safety products with our own production facilities.

Our main products include:

• Thermoplastic Road Marking Paint
• Reflective Glass Beads
• Hand Push Road Marking Machines
• Hydraulic Double Cylinder Thermoplastic Preheaters
• Road Marking Molds
• Traffic Safety Cones
• Other Road Safety Products

We provide OEM and ODM services and support customers worldwide with stable quality, professional technical assistance, and reliable supply.

If you are looking for a dependable supplier of thermoplastic road marking materials for projects in the Philippines or other international markets, feel free to contact us for more information.

Thermoplastic Road Marking Paint:High Reflective Thermoplastic Paint with Fast Drying