With the growing trend toward product personalization, heterogeneous color system primers are increasingly applied in construction machinery. This article verifies—through a series of tests—the impact of different primer colors on matching topcoats. Using engineering yellow topcoat as an example, five primer colors were selected for experimental validation: light yellow, light red, dark gray, rose red, and iron red.
Experiment 1: Gloss Comparison of Topcoat over Different-Colored Primers
Objective: Verify differences in topcoat gloss when applied over primers of various colors.
Instrument: BYK tri-angle gloss meter
Test Data:
Conclusion: Different primer colors have minimal impact on topcoat gloss.
Experiment 2: Color Difference of Topcoat at Varying Film Thicknesses over Different-Colored Primers
Objective: Verify color difference (ΔE) values of topcoat at gradient film thicknesses over different primer colors.
Instrument: X-Rite AM-94
Test Data:
Conclusion: With a color difference standard of ΔE ≤ 0.5, deeper primer colors have a greater influence on topcoat color difference, requiring thicker topcoat dry film to meet requirements.
Experiment 3: Mechanical Performance Comparison of Topcoat over Different-Colored Primers
Objective: Verify the influence of different primer colors on the mechanical properties of the topcoat system.
Test Data: