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During the application of the car body, there are unpredictable paint film problems such as bumps and scratches in the car paint, which cannot be prevented from causing body correction work on the car paint. The polishing treatment of car paint is a preparatory work before correction, divided into three types: craft polishing, wet polishing, and dry polishing. The craft polishing here is very simple and will not be specifically introduced here.

Advantages of wet and dry grinding under equal construction conditions: dust-free, less environmental pollution, more delicate grinding, and high grinding efficiency. Wet polishing should first immerse the sandpaper in water for 30 minutes. If conditions permit, use pure water such as deionized water to prevent impurities from scratching the paint film. Place a polishing block on the sandpaper for the slightly larger area to make it smoother and prevent unevenness. During the polishing process, use a wet sponge to wipe off the polishing slurry while polishing, and provide moisture for the polishing. After polishing, clean the polished surface with a damp sponge, and then blow out the gaps and grooves with compressed air.

Dry polishing is often performed using machines for convenience. First, use a 24 or 36 # coarse sand wheel disc to remove the outer coating; Use a 50 # grinding wheel to remove scratches on the steel plate; Then use 100~120 # grinding wheels to polish, and operate in this order to improve grinding efficiency and reduce filling workload. The bottom layer polishing usually requires a large amount of work, and a polishing machine is often used for large-scale polishing of old paint in areas with flat surfaces and low curvature. However, dry grinding has a high dust content and requires ventilation equipment. Operators need to wear breathing masks. Machine polishing can be done using a bias grinder with sandpaper sheets for polishing.

Article source: Automotive repair paint http://www.jinliangxincai.com