After the door sill is repaired, there is no impact on the vehicle. It should be noted that the paint surface of the car door sill is anti-corrosive, and the gloss of the anti-corrosive paint after spraying is different from that of other car paint surfaces, because the consistency of the anti-corrosive paint is thicker than that of ordinary paint, and it will have a pockmarked feeling after spraying. The painting time of the threshold is slightly longer than other normal painting time, and the working hours are slightly higher. It is necessary to repair the traditional painting process by painting. Generally, the following procedures are required: 1. Sheet metal correction is the preliminary plastic work of automotive sheet metal painting; 2. After sheet metal correction, there are still some defects that cannot be remedied by sheet metal work. Even if new parts are replaced, the center will be imperfect. In order to be more perfect and accurate, it is necessary to use sculpture technology to make up for the defects. Third, automotive sheet metal spray painting: automotive sheet metal spray painting is usually divided into three steps The first primer: filling the sand marks and micropores at the bottom of the workpiece, increasing the adhesion of the lower coating, and also having the function of defect indication. -< 2 > primer: prepare a well-lubricated working surface for the topcoat, complete the last procedure of all primer work, increase the adhesion of the participating layers and have a certain isolation effect to ensure the quality of the topcoat. (3) Topcoat: Topcoat is divided into single-layer paint and multi-layer paint, which is a color fixing layer and a decorative maintenance layer. Iv. Paint surface treatment of sheet metal and painting: Paint surface treatment is the last working procedure of topcoat. After the paint surface is dried and solidified, the defects on it will flow down to the center where a department is not satisfied, so as long as it is made up later, we call it mirror treatment. First, use 1200-2000 mesh beauty sandpaper (2500 mesh if necessary) to stop leveling and polishing, then use coarse wax composed of pumice or clay to stop polishing and cutting, and dispose of traces of sandpaper. Fifth, stop polishing with fine wax, remove traces of coarse wax, then treat with repairing agent to achieve perfect luster, and then completely remove halos and scratches with mirror treatment agent. @20 19