Automobile painting technology is also a kind of sheet metal painting and a kind of automobile repair technology. Is to repair the deformed part of the metal shell of the car. For example, if the car body shell is knocked out of a pit, it can be restored to its original state by sheet metal, and then the deformed car metal surface can be restored to the same state as other intact places by spraying special paint. 1. automotive sheet metal refers to the work of body damage analysis, body measurement, body sheet metal shaping, tension correction, stress relief welding, and body accessories assembly adjustment after automobile collision. 2. Baking paint is generally used for automobile painting. Basic process: (1) body rust prevention and internal painting: completed by the sheet metal worker according to the body condition. (2) Polishing and trimming the bevel edge: Use P60~ 180# sandpaper to polish the parts of the car body that need putty after being repaired by sheet metal. (3) Dust removal and cleaning: use pressure gun and desilication cleaner to remove dust and stains on the car body. (4) Sticking: Sticking textured paper with reverse sticking technology. (5) Priming: mix 4: 1 red primer, spray 1~2 layer to expose metal, and then dry. (6) Filling putty: Fill the concave position on the car body with mixed multifunctional putty and leave it at 20 degrees Celsius for 30 minutes. (7) Polishing putty: Polishing putty with P60~240# sandpaper, and checking flatness, pinholes and traces with hand feeling or polishing indicator layer. (8) Extra-young putty: choose it when necessary to fill pinholes, sandpaper marks, etc. (9) Polishing: Use P280# sandpaper to thoroughly polish the old paint that needs to be sprayed with intermediate paint. (10) Dust removal and cleaning: use pressure gun and desiliconization cleaner to remove dust and stains on the car body. (1 1) Sticking: Sticking masking paper. (12) Spraying intermediate paint: mix 2~3 layers of multifunctional intermediate paint, with an interval of 5~ 10 minute for each layer, then dry at 60 degrees Celsius for 30 minutes, and then spray the polishing indicator layer. (13) Polishing intermediate paint: polish the dried intermediate paint with P320~400# sandpaper. (14) Inspection: Check the grinding effect and carry out micro-filling. (15) Dust removal and cleaning: remove dust and stains from the car body. (16) Paste: Paste the shielded car body. (17) Dust removal and cleaning: firstly, blow out the dust spots on the car body with a pressure gun, remove the stains on the car body with a desilication cleaner, blow out the dust in the gaps of the car body with a pressure gun, and finally remove the dust on the car body with a sticky dust cloth. (18) plain paint spraying on top coat: spray 2-3 layers, with the interval of 5-10 minute for each layer, and add curing agent and diluent according to the temperature. (19) Primer spraying: spray 2-3 layers of plain paint, silver powder paint or pearlescent paint with an interval of 5- 10 minute. (20) Spray painting: mix and spray two layers of varnish every 5- 10 minute, and add curing agent and diluent according to the temperature. (2 1) drying: let stand for 5~ 10 minutes and dry at 60℃ for 30 minutes. Drying and curing need to be judged. If you feel sticky with your fingers, the surface is dry; If there is no fingerprint to the touch, it is semi-hard; If you don't have a fingerprint, click it and it's completely dry. (22) Waxing and polishing. (23) build a car. The purpose of building a car is to prevent the spray from spraying where it should not be sprayed. The traditional basic covering materials are covering paper and covering tape. The width of automobile cover paper ranges from 7 cm to 9 1 cm, which is heat resistant. Generally, it can be used safely in the drying room, with good wet strength, which can prevent solvent penetration (note: newspapers cannot be covered with newspapers, which are not heat-resistant and contain printing ink, which will dissolve in the paint solvent and penetrate into the topcoat below, causing pollution).