How can spray paint not flow?

1, during the first pass, reduce the amount of paint, on the one hand, save paint, on the other hand, avoid the first pass, the amount of paint is small, the air pressure can not be reduced, and the air pressure remains at the upper-middle level. Adjust the sector to the middle level, and spray the gun smoothly and evenly from bottom to top, with the gun speed interval of about 500px. Remember that the spray gun should gradually move away from the paint surface at the beginning and end.

2. The effect of the first spray does not need to be good or bright. In winter, another flow prevention method is flash drying time, which should be appropriately extended for 3 to 7 minutes. The degree of flash drying needs to reach the degree that the head and tail are not bright during the second spray. Usually, the first spray, flash drying time does not need to exceed two songs.

3. After the second varnish spraying, the proportion of thinner can be increased to 0.5 by paint mixing. When spraying, the paint output can reach medium, the sector is raised, the air pressure is still from bottom to top, and the gun speed can be slightly slower to ensure the paint surface is bright and smooth, but the gun speed is never lower than 15CM per second.

Common problems and solutions in spraying operation;

1, phenomenon: pilling

Reason: the job site is not clean and dust is mixed into the paint; After the paint is mixed and left for too long, the paint and curing agent have produced * * * particles; The oil output of the spray gun is too small and the air pressure is too high, which makes the paint poorly atomized or the spray gun is too close to the surface of the object.

Solution: clean the spray booth and cover the paint bucket; The paint should be mixed evenly and should not be left for too long; Adjust the spray gun to make it in the best working condition, and ensure that the muzzle is 20-50 cm away from the surface of the object.

2. Phenomenon: vertical flow

Reasons: too much thinner makes the paint viscosity too low and lose its viscosity; Too much oil, too close to the surface of the object or too slow spraying operation; Too much and too thick oil injection each time or too short re-injection interval; The surface of the object is uneven, especially the streamline shape is easy to produce vertical flow.

Solution: mix as required; Control the oil output, ensure the paint separation and improve the running speed of the spray gun; Don't spray too thick each time, it is best to master the interval brushing time twice; Control the oil output and reduce the thickness of paint film; Mix according to the instructions.

3. Phenomenon: orange peel

Reasons: too much curing agent makes the paint film dry too fast and the reaction is fierce; Too high spraying pressure makes the paint film wrinkle and unable to level; The temperature at the job site is too high, so the paint film should not be exposed to the sun.

Solution: mix according to the instructions; Adjust the air pressure, not too big; Pay attention to the site temperature, and slow drying diluent can be added to inhibit the drying speed.

4. Phenomenon: Whitening

Reasons: The temperature and humidity in the job site are high, and the paint film reacts violently, which may combine with moisture in the air to produce whitening phenomenon; Too much curing agent, too much at a time is too thick.

Solution: pay attention to the humidity on site and add waterproof white water to prevent whitening; Proportional modulation, one spray should not be too thick.

5, phenomenon: foaming

Original solid: compressed air mixed with water on the paint film, the temperature at the job site is high, and the paint dries too fast; The surface of the object has high water content and high air humidity; A spray is too strong.

Solution: oil-water separation, pay attention to drainage; Adding slow-drying diluent; Clean the surface and paint it with white water; It should not be too thick at a time.