1. Phenomenon: graining
Reason: the job site is dirty, dust is mixed into the paint; after the paint is mixed for too long, the paint and the curing agent have produced copolymerized particles; the oil output of the spray gun is too small, the air pressure is too large, and the paint is not atomized, or the spray gun is off the surface Too close
Solution: Clean the spray booth and cover the paint bucket; the paint should not be left for too long after the paint is mixed; adjust the spray gun to make it in the best working condition and determine the distance between the muzzle and the surface of the object is 20-50CM.
2. Phenomenon: vertical flow
Reason: Excessive thinner makes the paint too low viscosity and loses its viscosity; too much oil output, too close to the surface of the object or too slow spray operation; too much and too thick each injection or too short interval between resprays; Uneven, especially the streamline shape is easy to sag
Solution: proportion according to requirements; control the oil output to ensure that the spray paint is separated to increase the operating speed of the spray gun; each injection should not be too thick, and it is better to master the interval spray time in two; control the oil output to reduce the thickness of the paint film; Instructions for use
3. Phenomenon: orange peel
Reason: Too much curing agent makes the paint film dry too quickly and the reaction is violent; the spraying air pressure is too large, and the paint film cannot be leveled by wrinkling; the temperature at the job site is too high, so the paint film should be violent
Solution: According to the instructions for use; adjust the air pressure, not too high; pay attention to the on-site temperature, and add a slow-drying diluent to suppress the drying speed
4. Phenomenon: whitening
Reason: The temperature and humidity at the job site are high, and the paint film reacts violently, which may combine with the moisture in the air to produce whitening; excessive curing agent, too much and too thick spray at one time
Solution: Pay attention to the humidity of the site, add anti-white water to prevent the phenomenon of whitening; adjust according to the proportion, and the spray should not be too thick at one time
5. Phenomenon: blistering
Original solid: The compressed air has water mixed on the paint film, the temperature at the job site is high, and the paint dries too fast; the surface moisture content is high, and the air humidity is high; one spray is too thick.
Solution: Separate oil and water, pay attention to drainage; add slow-drying thinner; clean the surface, add anti-white water to the paint; not too thick at one time
6. Phenomenon: shrinkage
Reason: The primer or intermediate coating is not fully dried before applying the topcoat
Solution; spray according to the recommended thickness of each spray gun spraying layer.
7. Phenomenon: wrinkles
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 primer is putty incomplete; when the topcoat is sprayed, a gun is too thick, the internal deep agent is not volatilized in time, and the outside is dry. Quit.
Solution: Give enough drying time between each coat; only spray the second coat or wet spray after it dries.