A, sheet metal correction:

This is the preliminary plastic work for painting automotive sheet metal. We compare it to the human body, and the perfect human body is like the body of a model. Metaphorically, a luxurious fashion, if worn by a person with a broken limb, is nothing and eclipsed. Then if you let a fashion model wear it, it will look dazzling and noble. Very simple, how can a twisted car body set off the brilliance of paint? Many painters think that sheet metal is not their job, I don't think so.

Second, scraping ash:

After the automobile body is corrected by sheet metal, there are still some defects that can't be made up by sheet metal work. Even if new parts are replaced, there will be imperfections. In order to be more perfect and accurate, we must make up for the defects through sculpture technology. After the car is damaged due to deformation and other reasons, its flatness, wheel angle and lines need to be scraped and polished. This formula shows that scraping = restoring body skin = die product = die processing program. The body skin of any car is stamped with a mold, and we repair the body skin just like repairing the mold, so our scraping molding process should be connected with the mold processing, which is impossible for ordinary painters. Many painters who have worked for many years will sigh that it is easy to spray a car well, but it is difficult to do a good job, and it is difficult to grind a ball of ash in ten years. The person who said this may really understand what car painting is.

Third, automotive sheet metal painting: automotive sheet metal painting is usually divided into three steps.

<1> Primer: it fills sand marks and micropores at the bottom of the workpiece, increases the adhesion of the lower coating, and has the function of defect indication.

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< 3 > topcoat: topcoat is divided into single-layer paint and multi-layer paint, which is the color fixing layer and decorative protective layer. Single-layer paint is commonly known as plain paint, also known as ordinary paint, and can be completed in one layer. Multi-layer paints are divided into silver powder series paints and pearlescent series paints, which are completed in two-layer and multi-layer construction procedures. Silver powder paint adopts special aluminum material, which has high protection, strong outdoor stability and strong observability. Pearl series paint is made of mica and shells through high technology, which is a kind of high-grade paint with rich colors and strong decoration.

The spraying quality of topcoat is very high. It is not easy to be clean, plump, bright, not sagging, not hanging flowers, uniform luster, not leaking flowers, not flashing flowers, good leveling, not biting, not impetuous, not color cast. It's really not easy to accomplish these things in one go, which requires extremely rich experience and troubleshooting ability.

Four, the body panel painting paint surface treatment:

As the name implies, it is the last process of topcoat. After the paint surface is dried and solidified, the defects on it are treated. If we try our best, some imperfections will flow out, and then we can only remedy them later. In fact, the satisfactory paint surface is not perfect. For example, the loading paints of Mercedes-Benz and BMW will have slight fine scales. We generally call it orange peel phenomenon, which is a natural phenomenon caused by the drying time difference of paint film during leveling. Of course, it is difficult for ordinary people to detect it, and it can only be discovered if they have the level of expert appreciation. So if you want to fool the eyes of experts, you have to paint them, which we call "mirror treatment". First, use 1500-2000 mesh beauty sandpaper for leveling and polishing, and then use coarse wax composed of pumice or clay to polish to remove the traces of sandpaper. Next, polish with fine wax to remove traces of coarse wax, then use reducing agent to achieve perfect luster, and then use mirror treatment agent to completely remove ring lines and scratches. At this time, it can be achieved with paint.