(1) Body rust prevention and internal painting: It is 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 smoothness, 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 the touch has no fingerprints, it is semi-hard; If you don't fingerprint, 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).
The traditional sheet metal painting process generally requires the following processes.
1. Sheet metal correction is the preliminary plastic work of painting in automotive sheet metal.
Second, the scrapped (molded) automobile body has some defects that can't be compensated by sheet metal work after sheet metal correction. Even with new parts, there will be imperfect centers. 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 painting: automotive sheet metal painting is usually divided into three steps <1> Primer: filling 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. Top coat: Top coat is divided into single-layer paint and multi-layer paint, which is a color fixing layer and a decorative maintenance layer.
Four. Surface treatment of sheet metal and painting: The surface treatment of painting is the last process of finishing paint. When the paint surface is dry, the above defects will be removed, and if we try our best, it will flow to the center of a department that is not very satisfied. As long as it is supplemented 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.
Five: Next, stop polishing "silicon-free" with fine wax, remove the traces of coarse wax, then treat it with repairing agent to achieve perfect luster, and then completely remove the halo and scratches with mirror treatment agent. Sheet metal painting is a multi-process maintenance project with high technical requirements.