What are the reasons for bubbles during self spraying:

* : * : admin * : 2022-07-19 11:40:00 * : 31
What are the reasons for bubbles during self spraying:
Dalian metal plastic spray paint is caused by insufficient shaking before spraying and uneven mixing of paint liquid; Spray paint continuously, and do not stop after the previous spraying. Continue spraying after the paint surface is dry; Before spraying, the workpiece to be sprayed shall be cleaned with cleaning agent, and the pollutants shall be removed before spraying; Solution for bubbles and paint particles: for small bubbles and paint particles, wipe them off with clean cotton cloth and spray again after the surface of the paint film is dry; In case of serious bubbles and paint particles, the paint film must be completely dry, polished with sandpaper and then re sprayed.
You can cover other places with newspapers and other things to prevent accidental spraying. The nozzle should be 20 to 30 cm away from the place where painting is needed. It is easy to flow paint if it is too close. When spraying, try to keep a constant speed, fast and not slow. Spray again 5 to 7 minutes after spraying. In this way, the place you want to spray is basically covered for 3 to 5 times. If you are not satisfied, spray more times. If it flows accidentally, grind it with a knife or sandpaper after it is dry and spray twice.
Dalian metal plastic painting shall pay attention to the ambient temperature and humidity to prevent exposure, low temperature and too dry environment. When adjusting the gun, the amount of paint is too large and the air flow is too large, resulting in thick coating and splashing in the later stage, so bubbles are easy to appear. The viscosity of the coating is too high, the coating is thick at one time, the wood conduit is thick and deep, the hole filling is not solid, and contains air; The spraying air pressure is too high, and too much air is mixed in the coating. The temperature difference between the coating and the coated surface is too large. The coating ambient temperature is too high or the relative humidity is too high.
When heating is used to dry the coating, the temperature is too high, the standing time before heating the coating is not enough, the solvent is not fully volatilized, the paint itself brings bubbles, the bubbles generated during mixing are not eliminated, etc. Hot air spray gun shall be used to remove the blistering paint, let the wood dry naturally, then brush the primer, and then repair the paint on the paint surface.
If there is no water in Dalian metal plastic spray paint, it may be wood grain cracking. There is a small amount of air in it. As soon as it is exposed to the sun, the air expands and the paint skin bulges. There are many factors that cause this coating defect, such as painting on the base course that is not completely dry. When the paint film is dry, the internal solvent or moisture expands by heating and swells the paint film to form bubbles; Another example is that when the metal bottom layer is treated, the moisture accumulated in the pit is not removed and bubbling due to local corrosion. If there are already dust spots, they shall be polished to a smooth surface before recoating. Slight dust points shall be polished with fine sandpaper and polished.