8 Common Problems in Coating Construction and Emergency Handling Methods
1. Common problems in paint application and emergency handling methods: drips.
When painting on vertical surfaces, the paint film flows downwards, resulting in a bulging effect and poor application results.
Causes: The paint may be applied too thickly at once, the paint concentration may be too high, the spray gun pressure may be too high, the amount of paint may be excessive, or the nozzle may be too close to the surface being painted.
Solution: Dilute to an appropriate viscosity, adjust the spray gun pressure to 3.5-4.5 kg/m2, and ensure the distance is suitable (15cm-20cm).
2. Common problems in paint application and emergency handling methods: brush marks.
After brushing, the paint film appears uneven with streaks.
Causes: The viscosity is too high during application, and the wet film is reapplied.
Solution: Adjust the paint to an appropriate viscosity, ensure the base coat is mostly dry before reapplying, and do not apply too much pressure with the brush.
3. Common problems in paint application and emergency handling methods: pinholes.
After the paint film dries, small holes appear on the surface, which are caused by the substrate.
Causes: The paint film is sprayed too thickly, the drying temperature is too high, or the substrate has moisture, dust, etc.
Solution: Do not spray too thickly at once, control the drying temperature appropriately, and keep the substrate free of dust.
4. Common problems in paint application and emergency handling methods: dry spray phenomenon.
When spraying paint, the atomized paint dries before reaching the substrate, resulting in a rough surface.
Causes: The distance between the spray gun and the substrate is too far, or the spray gun pressure is too high.
Solution: Adjust the distance between the spray gun and the substrate to about 15cm-20cm, and set the pressure to 3.5-4.5 kg/m2.
5. Common problems in paint application and emergency handling methods: whitening phenomenon.
The surface of the paint film appears pale and lacks the expected gloss.
Causes: High humidity (over 80%), fast evaporation of the thinner, or the substrate being too cold.
Solution: The humidity during application should be over 80%, or add 5-10% anti-whitening agent, use a fast-drying thinner, and ensure the substrate is not too cold.
6. Common problems in paint application and emergency handling methods: peeling.
The paint film peels off in sheets from the surface of the substrate.
Causes: The substrate has wax, oil, water, etc., the base coat is not dry before reapplication, the substrate is too smooth, the wall has powdered, or low-quality filler is used, resulting in insufficient adhesion.
Solution: Thoroughly clean the substrate to ensure no wax, oil, water, or other debris is present; remove any powdered old wall completely; use oil-based or water-based filler to smooth it out, and allow it to dry completely before applying the paint.
7. Common problems in paint application and emergency handling methods: orange peel phenomenon.
The paint film is not smooth and has an orange peel-like texture.
Causes: The thinner evaporates too quickly, the spray pressure is inconsistent or too high, the distance is too far, the paint is applied too thickly at once, or the base layer is not dry before reapplication.
Solution: Use an appropriate thinner, control the spray gun pressure, maintain a suitable distance, avoid applying too thickly at once, and ensure the base layer is completely dry before reapplying.
8. Common problems in paint application and emergency handling methods: fading phenomenon.
After a few days, parts of the paint film fade, resulting in uneven color.
Causes: The new application is not completely dry, and excessive alkalinity causes the color to fade.
Solution: New walls should be painted after one month, using epoxy primer as the base.
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