Paint Construction Common Problems and Solutions

1, vertical flow:

When the coating is applied on the vertical surface, the coating film flows downwards, and the convexity phenomenon is caused, and the coating effect is not good.

Cause: It may be too thick or too thick at one time, too high paint concentration, too much air in the spray gun, too much paint, and the nozzle is too close to the coating.

Treatment method: dilute the excessive viscosity, adjust the spray gun gas, the pressure is 3.5-4.5kg/m2, the pressure is appropriate and output, and the distance is suitable (15cm-20cm).

2, brush marks:

After brushing, the coating film was uneven.

Cause: During construction, the viscosity is too high and the wet film is recoated.

Treatment method: adjust the coating to an appropriate viscosity. When coating, the base film must be substantially dry and the brush should not be excessively strong.

3, pinhole:

After the coating film is dried, the coated surface shows a small hole, and the small hole is formed by the surface of the substrate.

Causes: The coating film is sprayed too thick, the drying temperature is too high, the coated object has moisture, dust paint, etc.

Treatment method: Spray thickness should not be too thick at one time, control the proper drying temperature, and keep the coated object free from dirt and dust.

4, dry spray phenomenon:

The atomized paint on the paint is not dry until it has been applied, and it forms a rough surface on reattachment.

Cause: The distance between the spray gun nozzle and the object being painted is too long, and the air pressure of the gun is too high.

Treatment method: Adjust the distance between the spray gun mouth and the object to be coated, about 15cm-20cm, and adjust the pressure to 3.5-4.5kg/m2.

5. Albino phenomenon:

The surface of the paint film is pale and there is no expected luster.

Cause: The humidity is too high (80% or more), the thinner is too fast, and the object is too cold.

Treatment methods: Painting humidity should be more than 80%, or can add 5-10% of anti-white water, use a quick-drying thinner, the coated object should not be too cold.

6, peel off:

The coating film fell from the surface of the object.

Causes: The substrate contains wax, oil, water, etc. The undercoating is not dry and it is painted again. The substrate is too smooth and the wall surface has been powdered or used with poor soil and adhesion.

Treatment method: Thoroughly remove the substrate to ensure that there is no wax, oil, water and other debris, the old wall must be pulverized clean; with oil batch, or water-based batch approved, completely dry and then coated.

7, orange peel phenomenon:

The coating is not smooth, like an orange peel coating.

Causes: The diluent evaporates too quickly, the spray pressure is variable or the pressure is too high, the blowing distance is too far, one spray is too thick, and the bottom layer is not dry before painting.

Treatment method: Use appropriate diluent to control the pressure of the spray gun. The distance should be moderate. Do not apply a thick coating. The bottom layer is completely dry and then coated.

8, fade phenomenon:

A few days after the film was coated, the color part faded and the color was not uniform.

Cause: The new addition is not completely dry, and the alkali is too heavy, causing the color to fade.

Treatment method: The new wall should be painted one month later with an epoxy primer.