The paint can be diluted with diluent, and the paint with the required viscosity can be obtained by adding the diluent into the paint according to the required proportion and uniformly stirring.

This method is not only convenient to use, but also has obvious effect; The disadvantage is that the diluent belongs to volatile organic compounds, which will pollute the environment, and the use cost is high, and it is difficult to accurately control its dilution effect, resulting in inaccurate viscosity.

2. Heating method

Because the viscosity of paint will change with the change of temperature, its viscosity will be obviously reduced after heating to increase its temperature, reaching the standard of spray painting processing.

It takes a lot of energy and special equipment to adjust the viscosity of paint for spraying processing by heating. In order to keep the viscosity of paint stable during painting, it is necessary to keep the working environment temperature constant.

3. Shear method

This is a widely used method to reduce the viscosity of paint in spraying processing. Note that it is effective for non-Newtonian pseudoplastic fluids and plastic fluids. Moreover, when feeding under pressure, only the stable conveying pressure is often used in the spray painting treatment system, and the viscosity of pseudoplastic fluid will change under the action of shear.

4, visual method

Stir the paint evenly with a stick (iron stick or wooden stick), stir it to a height of 20 cm, stop and observe, if the paint solution does not break in a short time (a few seconds), it will be too thick; If the thread breaks as soon as it leaves the upper edge of the bucket, it is too thin; This viscosity is straight when the paint solution just stops at a height of 20 cm, and stops flowing instantly, which is more suitable when it drops down.