Phenomenon： Substrate, paint film and coating, the adhesion between layers is very poor, causing some or even all of the paint film or clad layer to peel off.
1.1. Problem：Primer comes off.
1.2. Phenomenon：Film peeling occurs between primer and substrate.
1.3. Causes and solutions
Causes | Solutions |
Changes in customers’ materials (Higher polar components such as PP / nylon, glass fiber) | Strictly control the quality of the substrate |
The surface of the substrate is not clean, and there are mold release agents and oil stains on the surface. | Thoroughly clean the surface of the substrate. |
Paint does not match the workpiece. | Use matching paint. |
Baking temperature and time is not enough and solvent volatilization is not complete. | Properly increase the baking temperature and extend the baking time. |
The surface of workpiece is too smooth. | Appropriately polish the workpiece or pre-process the workpiece |
The paint is not cured completely and the cross-linking is not tight. | Strengthen the curing of paint film. |
The baking time is too long,so that the paint surface is annealed. | Strictly follow the construction process. |
Primer and top coating do not match. | Use the matching primer and top coating. |
2.1. Problem：Plating peels off.
2.2. Phenomenon：The coating falls off between the coating layer and the primer.
2.3. Causes and solutions
Causes | Solutions |
The primer is not cured completely. | Strengthen the curing of paint film. |
The surface of the substrate is not clean, and there are mold release agents and oil stains on the surface. | Thoroughly clean the surface of the substrate. |
Primer or UV primer is over-cured. | Strictly follow the construction process. |
Primer and top coating do not match. | Use the matching primer and top coating. |
3.1. Problem：Top coating peels off.
3.2. Phenomenon：The coating falls off between the coating layer and the top coating.
3.3. Causes and solutions
Causes | Solutions |
The plating layer is exposed to the air for too long (Water and oil pollution) | Avoid prolonged exposure of the coating layer to the air. |
Incomplete solvent evaporation. | Properly increase the baking temperature and extend the baking time. |
Topcoat is not cured completely. | Strengthen the curing of paint film. |
Color dyes is added too much and the paint is sprayed too much. | Strictly follow the construction process. |
Poor adhesion of blue and green paint(common phenomenon in the industry) | Add green and blue adherence promotors. |