First of all, because the car body is sprayed with an automatic machine and the car paint repair is sprayed with an air gun, the spraying principles of the two methods are different. Automatic machine spray is to spray paint evenly along the tangent direction by using a rotor at high speed, and it also has the function of high-voltage static electricity. Air spraying is the use of high-pressure compressed air to atomize paint and spray it on the body surface. Spray aluminum powder to lie flat, and the positioning effect is ideal; Automatic spraying aluminum powder to stand obliquely. Obviously, these two different arrangements reflect two different colors. The paint film of automatic spraying is darker in color. In order to avoid this situation, the general method is to add toner to the original paint until it matches the color of the car body.
The baking temperature is different. Secondly, use a heating lamp for maintenance. This temperature is almost different from that of the drying chamber. Only workers who have been engaged in repair work for a long time can do it by experience. (The mechanism of color difference is the same as that in section 1.3) In short, when the color difference is large, it is best to rework the parts.
The color difference between car body and plastic parts is mainly caused by the following reasons: first, the base materials of the two are different; Second, the process temperature and spraying method are different. Their basic materials are different. The body background color is gray, and the bumper background color is black. If it is a color with low hiding power, it is easy to produce color difference. According to our company's experience, the bumper primer changed from transparent to gray on the same car body and achieved good results.
To sum up, I believe you already know why the touch-up paint is poor in color. You are welcome to express your opinions in the comment area, and Bian Xiao will also interact with you in the comment area.