The reason why white road marking paint turns yellow after delineation

The main reasons for white road marking paint turning yellow after marking include the following:

Resin quality problem:
Road marking paint, especially hot melt marking paint, usually uses petroleum resin as the main ingredient.
If the purity of the petroleum resin is not enough, or mixed with other impurities (such as C9, etc.), then the quality of the paint cannot be guaranteed.
Problems with the quality of the resin may cause the paint to turn yellow gradually during use.

Insufficient titanium dioxide content:
Titanium dioxide is an important pigment ingredient in road marking paint, which is vital to ensure the white color of the paint.
If the content of titanium dioxide is insufficient, then the white color of the paint cannot be effectively ensured and yellowing may occur after marking.

Incorrect construction techniques
Insufficient drying time: If the paint does not cure correctly, it may be more susceptible to environmental factors that can cause discoloration.
Heating at too high a temperature or for too long: heating is a necessary step in the paint application process. However, if the heating is done at too high a temperature or for too long, the material of the paint may have a tendency to deteriorate. Resins may deteriorate when heated to approximately 200 degrees, resulting in a reduction in paint performance, which in turn causes discoloration of the scribe line.

Reaction with asphalt
Asphalt Oil Seepage: Freshly paved asphalt can release oil (bitumen) that seeps into the paint, resulting in a yellow or brownish tint.
Chemical interactions: paint may react chemically with the asphalt surface, changing its original color.

Prevention Tips:

Use high-quality, UV-stable paints with weather-resistant additives.
Choose water-based or epoxy paints less prone to yellowing.
Apply a protective topcoat to shield the markings from environmental exposure.
Ensure proper surface preparation and curing times during application.
If discoloration persists despite preventative measures, regular maintenance and re-application may be required.

In addition, our company is committed to producing high-performance, long-life road marking paint in a variety of colors, including white, medium yellow, dark yellow, orange red, blue, etc., and can also be adjusted according to the needs of the color. Meanwhile, we provide road marking machine and its supporting equipment, looking forward to cooperating with you.