1. The principle of removing marks from toothpaste is similar to that of waxing. There are some abrasive ingredients in the toothpaste, which can smooth out the slight scratches on the paint surface. But for deep scratches, this method is powerless.

2. Cars are generally divided into four layers of paint. The first layer, close to the car body steel plate, is called electrophoretic paint, also called primer, which is used for rust prevention and corrosion protection. The second layer is the intermediate coating. The main function of the intermediate coating is to increase the thickness of the paint surface, and at the same time, it also has the function of preventing stone strike. The third layer is paint, which together with the intermediate coating determines the color of the car body. Metal paint will add aluminum pearlescent paint to color paint and mica to make the car look brighter. The fourth layer is the varnish to be treated now, which can increase the gloss of the car body and enhance the chemical resistance.

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