Car Paint Process Flow

After the completion of the sheet metal processing

1. Find some high places and recesses. Generally, we can deal with high places, but in general, if the depressions are not too serious, it is acceptable to use putty.

2. Find out some burnt paint, loose surface paint and bottom putty. If there is such a phenomenon, use a sand mill to remove it, otherwise it will cause blisters and cracks in the future.

3. If the area of sheet metal is large, you should check to see if there is expanded iron. Large area iron sheets such as the top cover of the machine cover are too easy to expand iron. If you ask the sheet metal to finish the fire, look at it again, because it will never be flat after the fire is finished.

4. Before filling up the putty, you have to use 180# sandpaper to grind the surface, especially the smooth place, because in the place where the 180# sandpaper is not worn, the putty will leave a joint after the subsequent water grinding. , Blow off the dust on the surface at the 180th place after grinding, so that the putty can be refilled.

2. Putty's replenishment method:

In the first pass, putty is thinly scraped on the surface of the iron sheet.

For the second course, scrape the concave area once, and then touch it after drying to see if it is okay. If it is not too serious, you can go to the next course.

The third way is to scrape all the places where you want to scrape, you can see if there is a high point, and if there is one, deal with it first.

The fourth way is to scrape it all over, paying attention to the corners.

The fifth step is to shave the corners and pores on the surface and then the interface. Generally speaking, the fifth step is not very thick, so it is easy to polish the pores, and some scraping methods use three steps. They have thicker repairs and will encounter many problems later. For example: high spots, sand marks, large pores. The treatment of high spots can only be knocked down. Generally, you have to use No. 60 coarse sandpaper to make a thicker. We generally only use No. 180 and No. 60 sandpaper to make the sand surface naturally thick. The thick pores are not easy to handle. Yes, because if it is not completely resolved, the paint on the surface will be absorbed to the bottom layer after the warp, so there will be some small holes after the paint is sprayed.

3. Water mill and commonly used sandpaper: No. 180 is used to grind the surface. It can only be worn on the putty and can not be grind to the perfect place and the interface, because it will leave deep sand marks. No. 180 was performed while grinding and touching, because it was dented again because of too much grinding. No. 320 is to change the sand marks left by No. 180 and the handling of the interface. No. 800 is to change the sand mark, and it has to be polished off the entire spray paint area. No. 1500 and No. 2000 are to grind the areas where only varnish is sprayed and the areas to be polished, such as particles and streamers.

Fourth, the role of eye-filling is generally to leave some small holes and sand marks on the putty after grinding, while the eye-filling is to fill the small holes and sand marks, and the eye-filling can only be thinly scraped. It's okay, and don't leave too much ash on it when grinding because it does not have the firmness of putty, if you leave too much, it is easy to produce blisters.

5. The spraying method and function of the primer. The ratio of primer and thinner is one to one. If the primer sprayed out with less thinner is too thick, it will be difficult for us to find sand marks and pores, and the primer is too thick. The lacquer itself will also leave small pores, and it should not be too thin, because it is too thin to cause sagging, and it will bite the bottom in severe cases. Biting the bottom will cause wrinkles. This is a troublesome thing. Make up the putty after scraping it off, if it is not handled well, the paint will bite the bottom after spraying. The function of the primer is to have good adhesion and good adhesion with the surface paint layer, and it can also fill in the smaller sand marks, pores and interfaces, and it is easy to polish and prevent rust. Most of the current primer gray is gray, because gray is the best color to be concealed by the top coat, especially metallic white and silver paint. The primer has anti-foaming and paint stripping effects.

6. After spraying the primer and waiting for a few minutes, you can directly scrape and fill the eye dust. This is the last link to find out the problem. If you are afraid of not being able to fill it cleanly, you can look for it again after the primer is polished and the water is blown dry.