Air spraying was originally developed as a coating method for quick-drying coatings such as nitro coatings. This method is easy to coat paint with poor brushability, and has the following characteristics: high coating efficiency, spraying 150 -200m2 per hour, which is 8-10 times that of brushing. ? Strong adaptability, can adapt to all kinds of paints and workpieces with various materials and shapes, and is not limited by the site (but dust is not allowed in the environment). As long as there is a power supply, it can be used, especially suitable for the construction of quick-drying coatings, and it is a widely used painting method at present. ? The film thickness is uniform, smooth and flat, and the appearance is decorative. ? The paint mist flew away. When air spraying, paint mist is easy to fly away, which pollutes the environment and causes a lot of paint loss. The utilization rate of paint is generally around 50%, or even less. The coating is of good quality and is obtained by air spraying.