Poor Adhesion

Bad joint between top coat and primer, or between top coat and existing paint, or between primer and bare metal.

Common Cause

1. Main reason: Incorrect surface cleaning and preparation. Dust or other contaminations remained on the surface lead to poor adhesion.

2. Incompatibility of primer and top coat or incompatibility of primer and substrate.

3. Spray top coat before the under coat dries.

4. Insufficient sanding or absolutely no sanding makes the substrate too smooth.

5. Bad quality thinner and lack of solvency.

6. Masking without the first color completely dry during dual-color application.

7. While painting silver color, no enough flash-off time between coats or too high viscosity.

8. Too long flash-off time between basecoat and clear coat.

9. There is invisible water film on the primer surface when spray top coat: ① The weather is too humid while applying primer surface. ② Dry overnight os the primer in humid enviorment.

10. The paint film dry too much before removal of masking may cause peel-off at the edge.

    
    

Repair

(1) In serious case, remove the existing paint and apply the color system again.

(2) If caused by the paster, re-sand the affected area and re-spray.