What is the difference between car repaint and original car paint? Why is it said that repaint cannot be used?

Driving every day, small scratches are basically unavoidable. Scratches will damage the paint, and the paint surface will be damaged, which not only affects the appearance of the vehicle, but also rusts over time, so it is necessary to Touch up paint. The life of the paint that is refinished later is often shorter, and there are various problems such as color difference. So what is the difference between the original car paint and the refinished paint?

First of all, there is a difference in the quality of the paint. The original car paint is a paint certified by the factory's coating technology department. It has very good adhesion, corrosion resistance, and wear resistance. The quality of paint from repair shops varies greatly, and the quotes from different repair shops for the same part will also vary greatly. Because the quality of paint is different, the purchase price will be different, so spray painting cannot be just for cheap.

The second is the difference in spraying process, which is the most critical. First of all, the original car painting workshop is a real dust-free workshop. There are no people inside, only machines are operating. Even if people need to enter, they need to completely remove dust from themselves before entering.

The original car paint consists of an electrophoretic layer, a mid-coat layer, a color paint layer and a varnish layer. Electrophoresis is to immerse the entire car shell into the paint. There is a large paint pool. The car shell is placed in it and electricity is applied, and the paint will adhere to it evenly. This is not available in repair shops. The intermediate layer can provide stronger adhesion conditions for the paint layer. The spraying of paint and varnish is done using a robotic arm, which is completely computer-controlled and very precise. The distance between the spray gun and the car body, the spray angle and the running speed all have strict requirements, so that the sprayed paint will be very even and consistent in thickness, without causing spots, marks or paint flow.

Disadvantages of post-paint touch-up:

The post-paint paint cannot achieve the craftsmanship of the original car paint. 1. First of all, the workshop cannot be dust-free. It would be good if the door can be closed when painting. 2. Secondly, it is all done manually. In terms of uniformity and paint thickness, it is incomparable with mechanical spraying. 3. The quality of the paint used later is different from that used by the manufacturer. The paint used at the 4S store may be the same as the paint used by the manufacturer, or it may be different. Anyway, when you go to touch up the paint, they will tell you that it is the original paint.

4. The color of the paint is all adjusted by yourself. If the car is a color that is difficult to adjust, there may be color differences during the paint adjustment. 5. Color difference will occur due to problems with the spraying process. If the paint you spray has no color difference, it means you have met a good painter. We can't tell it unless we look carefully. 6. When spray painting, putty will be used to repair and smooth it. This will cause the paint surface to pop off and peel off if the area is slightly stressed in the future. If you use poor quality paint for a year or two, it will become violent on its own.

So for small scratches on the car, if the area is small and does not affect the appearance very much, you can not touch up the paint first. Consider a touch-up pen or use the paint that has been mixed by the 4S shop to dot it to prevent it from happening. rust. Because if you are spray painting, even if the area is small, in order to prevent the color difference from being too obvious, you need to spray the entire surface. For example, if there is a scratch on the car door, you need to spray the entire door, and if there is a scratch on the front hood, you need to spray the entire front hood, so it is still not cost-effective. But if the scratched area is large, it must be repainted, otherwise it will not pass the annual inspection. If there is deformation and needs plastic surgery, it must be repainted.