The technique of Automotive spray Gun (I)

1. The control of spray gun trigger.

The tighten the trigger are squeezed, the greater the liquid flow rate will be. In traditional process, the trigger is always squeezed, not half squeezed. In order to avoid the accumulation of paint sprayed at the end of each process, the experienced painter will slightly loosen the trigger to reduce the amount of paint.

The correct operation of pulling the trigger is generally divided into 4 steps: first start from the cover paper, pull the trigger in halfway, and only release the air. When you reach the edge of the painted surface, completely pull the trigger to spray paint. When you go to the other end, then the trigger is released halfway and the paint stops flowing out. Move a few centimeters forward before the reverse spraying. Then repeat the above steps.

In the "spot" repair or the edge polishing process of the new spray paint layer, the "edge finish" operation must be done. This means that the trigger is not pulled at the beginning of the gun, that is to say, the amount of paint supplied at the beginning is very small. With the movement of the car paint spray gun, the amount of paint is gradually increased, and the trigger will be released until the process is about to end. The amount of paint supplied is greatly reduced, thus obtaining a special transition effect.

2. The angle between the spray gun and the working surface.

The spray gun must be perpendicular to the work surface (90°), and must not be swung in an arc by the wrist or elbow.

3. The distance between the spray gun nozzle and the working surface.

Normally the spraying distance should match the air pressure of the spray gun, the adjustment of the fan surface of the spray gun and the type of paint. Generally, the spraying distance is about 20cm. The actual distance can be determined by spraying the paper on the wall. If the spraying distance is too short, the speed of the spraying airflow will be higher and the coating will appear ripples. If the distance is too long, there will be too much solvent evaporated, causing orange peel or drying of the coating, then affect the color effect.