The problem of poor coverage during the color changing construction of light colored road surfaces

Road surface color changing coatings are an important means of improving the aesthetics and functionality of roads, and light colors (such as beige, light yellow, and light gray) are widely used in urban roads, scenic trails, and other scenes due to their fresh visual effects. However, the problem of “poor coverage rate” often occurs during construction – the paint cannot completely cover the original road surface, resulting in discoloration, exposure, or uneven color, which seriously affects the final effect. TOP ROAD Technology Co., Ltd. has been deeply involved in the field of marking for 30 years. With over a thousand experience in color modification projects, we can dismantle the root cause of poor coverage and provide practical solutions for you.

1、 The Five Core Causes of Poor Coverage

Material characteristic limitations: Light colored coatings have lower pigment content (such as a lower proportion of titanium dioxide), resulting in naturally weaker coverage than dark colored coatings; Some low-priced coatings use ordinary resin, which has strong transparency after film formation and is easy to reveal the base color.

Inadequate surface treatment: The original road surface has floating ash, oil stains, or partially cured old coatings, forming an “isolation layer” that hinders the adhesion of the coating; Cement pavement has sanding, asphalt pavement is loose, and the coating cannot form a continuous film layer after penetrating the pores.

Insufficient construction thickness: In order to pursue “thin coating and fast drying”, the coating is too thin (below the standard thickness) during construction, which cannot cover the surface defects; Uneven equipment pressure or excessive pushing speed can lead to local leakage or thin coating.

Environmental interference: Under high temperature conditions, light colored coatings dry too quickly and solidify before being fully leveled, forming “orange peel patterns”; The evaporation of moisture on the wet substrate causes the surface of the coating to shrink, revealing the underlying color.

Ratio and process deviation: The ratio of coating to diluent is unbalanced (excessive diluent), resulting in a decrease in coating viscosity and inability to adhere to the substrate; Non layered construction (such as applying primer to seal pores before applying surface layer on cement pavement) results in insufficient covering power.

2、 Four step system solution

1. Emergency repair (already constructed area)

Partial touch up coating: After cleaning the floating dust in the exposed area, apply a high coverage special topcoat from the manufacturer of Three Ais Road Surface Color Change Coating (with a coverage increase of 40%);

Overall recoating: For large areas of discoloration, the old film needs to be thoroughly removed, and the process of “sealing with bottom glue → applying thick surface layer” should be followed for re construction.

2. Material Science Selection

High coverage formula: using San Ais nano grade titanium dioxide modified coating (coverage power ≥ 95%), which improves by 30% compared to ordinary coatings;

Environmental adaptation type: For humid/high temperature scenarios, we provide fast drying and anti-seepage specialized formulas to reduce water evaporation interference.

3. Deep treatment of the base surface

Cleaning and Decontamination: Rinse the old road surface with a high-pressure water gun, wipe off the oil stains with solvent, and ensure that there are no visible pollutants on the base surface;

Pore sealing: Apply epoxy sealing primer (penetration depth ≥ 2mm) from the manufacturer of three Ace road surface color changing coating on cement pavement, and apply high viscosity primer on asphalt pavement to block the penetration of the coating into the pores.

4. Precise process control

Thickness grading construction: Bottom layer 0.6mm (closed pores)+surface layer 1.2mm (forming a continuous film layer), total thickness ≥ 1.8mm;

Equipment parameter calibration: Adjust the pressure of the marking machine to 0.3-0.5MPa, stabilize the vehicle speed at 3-5km/h, and ensure uniform coating coverage.

3、 Preventive construction standards

Triple acceptance of base surface: cleanliness (no floating ash or oil stains) → porosity (cement pavement ≤ 5%) → strength (pull-out test ≥ 1.2MPa).

Dynamic quality monitoring: Use a wet film gauge to measure the thickness (deviation ≤ 0.3mm) for every 100 square meters of construction, and compare the color uniformity with a color chart.

Special scenario enhancement: When redrawing old lines, the old markings need to be polished to expose a fresh base surface and coated with interface enhancer to enhance adhesion.

4、 Technical empowerment of TOP ROAD pavement color changing coating manufacturers

TOP ROAD provides:

✅ Customized coating with zero penetration:

Nano scale pigment dispersion technology increases coverage by 50% and color fastness exceeds twice the national standard;

Quick drying formula (surface drying ≤ 15 minutes), reducing the impact of high temperature/humid environments.

✅ Intelligent construction system:

Base moisture content detector+wet film thickness gauge, real-time monitoring of construction parameters;

High pressure airless spraying equipment with a stable pressure of ± 0.05MPa to ensure uniform coating.

✅ Full process guarantee:

Pre construction site investigation report+customized process plan;

During the warranty period, if the coverage rate does not meet the standard, free rework will be carried out and related material losses will be borne.

Our company is a professional manufacturer of road hot-melt coatings, road retroreflective measuring instruments, and road marking machines. If you are interested, please feel free to communicate with me via email at any time export@toproadtraffic.com