HS code-based invoice validation

List of the catalog of this article:

• 1,HS code-based invoice validation Automotive sheet metal spray paint scraping material
• 2, Car spray paint full of dust scratching skills
• 3, Will the car crack when scraping thick dust?

Materials for automobile sheet metal spray paint and ash

water grinding paper, atomic ash, eye filling ash, primer, topcoat, tape paper, masking paper, borrowed water, newspaper, plastic primer. Tools: blade steel, grinding disc, large scraper, spray gun. There are four basic components of automotive paint: film-forming substances (resin), pigments (including physical pigments), solvents and additives. I hope I can help you.

Car sheet metal is a technical means of car repair, which refers to the repair of the car body after a collision, that is, all the work except for the spraying of anti-corrosion and decoration of the car body.

Materials: water frosted paper, atomic ash, eye filling ash, primer, topcoat, tape paper, masking paper, excuse water, newspaper, plastic primer. Tools: shovel steel sheet, grinding plate, large scraper, spray gun. There are generally four basic components of car paint: film-forming substances (resin), pigments (including constitution pigments), solvents and additives.

The last scratch of the car sheet metal is red gray. The red gray is very delicate and can completely cover the traces left after sandpaper polishing. Scratching red gray is used to prepare for spraying primer.

Car spray paint full scraping skills

1. When the uniformity of the thickness of the paint layer is high, the cross-spraying method should be adopted, and then water Spraying in the flat direction. Generally, small abrasions have scars on the surface of the paint, and the scars are white. That is the surface of the paint that has been shaved. There is no need to repaint. Light, beat with sand wax or wax several times.

2. Round-trip scraping method: first, apply the putty to the edge of the plane into a line, the tip of the scraper is pushed outward at an angle of 30°~45°, scrape the putty on the low sink, and squeeze the excess putty into a line on the right side of the scraper mouth.

3. Scrape firstGrind the part with sandpaper, clean it, scrape it roughly first, fill in the large defect, and scrape it carefully after curing. After it is completely dry, sand it with sandpaper. After qualification, scrape it with eye filler to make sure that there are no defects on the surface.

4. Here are some technical skills, methods and tips for car painting: thinners must not be put in too much, only less. 1:08~1. When spraying a piece of paint, you must estimate the dose. If it is not enough, use black or white paint mixed with original paint as a primer and then use the original paint cover.

5. The skills of edging when repairing and painting cars. Painters need to carry out the so-called edging operation when repairing spots or doing the edges of the new spray coating and the old coating.

6. Automotive sheet metal painting: We usually divide automobile sheet metal painting into 3 steps <1> first road bottomPaint: Fill the sand marks and micropores at the bottom of the workpiece, increase the adhesion of the lower coating, and also have the function of indicating defects.

Will the car crack when scraping thick dust?

1. The thicker the car paint is scraped with atomic ash, the worse the toughness. It can't be as elastic as the body steel plate, and it is easy to crack.

2. There may be several reasons for cracking: the damaged surface is not well treated; the putty is too thick; the putty is not thoroughly polished after scraping; the interface is not good, and the paint is sprayed without waiting for the putty to dry.

3. It must be related to the thickness. If it is too thick, it is easy to crack. It is also possible to freeze and crack in winter, and it is also possible to crack in the summer when it is too hot. It's not reliable to say that the car is upside down.

4. If the putty is thick, it will cause the putty to crack after a period of use, causing the body paint to fall off.After the paint falls off, the car body will rust. The rust of the car body will cause the car body to rot. When repairing sheet metal, use putty to flatten it, because the surface of the car body is uneven after sheet metal repair.

5. The cracking of car putty will become bigger and bigger, and the putty needs to be repaired in time. Car paint putty cracking generally cannot be repaired by yourself, and it is not recommended to repair it blindly by yourself. The reason why the car putty cracks is likely to be that the car putty is too thick, so the moisture in the putty is easy to cause cracks on the paint.