1. Phenomenon:
Granulation Reasons: The work site is unclean and dust is mixed into the paint; the paint is left for too long after being mixed, and the paint and curing agent have produced copolymerized particles; the oil output of the spray gun is too small and the air pressure is too high, resulting in poor atomization of the paint or the spray gun is away from the surface too close.
Solution: Clean the spray booth and cover the paint bucket; the paint is well mixed and should not be left for too long; adjust the spray gun so that it is in the best working condition and make sure the distance between the gun muzzle and the surface is 20-50CM.
2. Phenomenon: Wrinkling Reasons: The drying time is too short or the paint film is too thick; the curing agent in the primer or putty is improperly selected; the putty of the primer is incomplete; the gun is too thick when spraying the topcoat, and the internal deep agent does not evaporate in time, causing the outside to dry out and the inside to dry out. Don't do it.
Solution: Allow sufficient drying time between each coat; only spray the second coat or spray wet after drying.
3. Phenomenon: Shrinkage Reason: The primer or intermediate coat is not dry before applying the topcoat.
Solution: Spray according to the recommended thickness of each sweep gun spray coating.
4. Phenomenon: Blistering Original solid: water is mixed into the paint film in the compressed air, the temperature at the job site is high, and the paint dries too quickly; the moisture content of the surface is high, and the air humidity is high; one spray is too thick.
Solution: Separate oil and water and pay attention to drainage; add slow-drying thinner; clean the surface and add anti-white water to the paint; it should not be too thick at one time.
5. Phenomenon: whitening Reason: The temperature and humidity at the job site are high, and the paint film reacts violently, which may combine with moisture in the air to cause whitening; excessive curing agent, too much and too thick a spray at one time.
Solution: Pay attention to the humidity on site, and add anti-whitening water to prevent the whitening phenomenon from occurring; adjust according to the proportion, and do not spray too thickly at one time.
6. Phenomenon: orange peel Reasons: Too much curing agent causes the paint film to dry too quickly and reacts violently; the spraying air pressure is too high, causing the paint film to wrinkle and become unable to level; the temperature at the job site is too high, causing the paint film to react violently.
Solution: Follow the instructions for use; adjust the air pressure, not too high; pay attention to the temperature on site, and add slow-drying diluent to inhibit the drying speed.
7. Phenomenon: vertical flow Reasons: Excessive diluent causes the paint viscosity to be too low and lose viscosity; the oil output is too large, too close to the object surface or the spray operation is too slow; the amount of oil sprayed each time is too thick and too thick or the interval between re-spraying is too short; the object surface Uneven, especially streamlined shapes that tend to sag.
Solution: Proportion as required; control the amount of oil output to ensure that the spray distance is high; increase the operating speed of the spray gun; each spray should not be too thick, and it is best to control the interval between spraying in two sprays; control the amount of oil output to reduce the thickness of the paint film; press Instructions for use ratio.
