Introduce several methods commonly used by spray gun to spray the inner wall ...

There are generally the following methods for spraying the inner wall of the pipeline with a spray gun, which are dry spraying, wet spraying, wet-on-wet spraying, virtual gun spraying, primary coating, secondary coating, etc. Let's take a look at the basic principles and processes of each type of spraying.

1. Dry spraying: When spraying the inner wall of the pipe, the solvent selected should dry quickly, the pressure is higher, the paint volume is smaller, the humidity is higher, and the paint surface is dry after spraying. Such as spray primer, metallic paint.

2. Wet spraying: When spraying, the selected solvent should dry slowly, the air pressure is small, the paint volume is large, and the temperature is low. The paint surface is wet after spraying. Such as spraying alkyd paint, baking paint.

3. Wet-on-wet: The second coat of paint can be sprayed on the inner wall of the pipe when the paint is wet and the paint surface dries.

4. Virtual gun spraying: It means that after spraying the pigment paint with the spray gun, it is mixed with a small amount of paint containing a large amount of solvent and then sprayed on the surface to be sprayed. The purpose of virtual gun spray is to touch up between the old and new coats and to remove the marks of repair. In addition, after spraying the alkyd topcoat, spraying with a virtual gun can increase the brightness of the coating film.

5. Atomized spraying: also known as flying paint spraying, and then spraying with metallic paint or when encountering stripes and spots, use atomized spraying.

The specific method is:

1. Adjust the spray gun on the inner wall of the pipeline (full open)

2. 30～45cm away from the surface to be sprayed

3. Trigger the gun to 75% and keep it constant, and spray continuously around the area to be sprayed to obtain a uniform flash color and appearance.