China spray gun has a large spray distance and low utilization rate of paint. At the same time, the paint particles are also in the air for a long time. For quick-drying paints, it is possible that when the paint mist reaches the surface of the workpiece, the viscosity is too large to affect its leveling, resulting in orange peel and granules. If the spraying distance is too close, it is easy to cause problems such as sag, wrinkles and uneven spraying.