Causes of paint sag

2025-07-12 01:05:32

During the paint coating process, various defects can occur on the paint film. These issues are typically influenced by several factors, such as the condition of the object being coated, the type of paint used, the coating technique and application method, the painting process, the equipment in use, and the environmental conditions. Based on our company's past experience, the common causes of sagging include the following:

(1) The paint viscosity is too low, and the coating is applied too thickly;

(2) The spraying distance is too close, and the spray speed is too slow;

(3) Excess paint is not properly removed during the coating or dip coating process;

(4) The air pressure during spraying is inconsistent;

(5) The surface of the object is uneven, poorly prepared, or contaminated with oil and water.

To prevent these issues, the following control measures can be implemented:

(1) Adjust the paint viscosity appropriately and ensure that each coat is not too thick;

(2) Maintain an optimal spraying distance and control the spray speed to avoid over-application;

(3) Remove any excess paint before it drips, and keep the air pressure stable throughout the process;

(4) Ensure that the surface is clean, dry, and properly prepared before applying the paint.

In addition, regular maintenance of the painting equipment and proper training for operators are essential to minimize the risk of sagging. It’s also important to monitor environmental factors like temperature and humidity, as they can significantly affect the drying and flow properties of the paint. By addressing these factors systematically, the quality of the painted finish can be greatly improved, reducing defects and ensuring a more uniform and professional appearance.

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