Construction of water-based paint spraying method is one of the most important method, coating the surface with a spray can get thin and uniform coating, the geometric shapes, with small holes, cracks, uneven surfaces of the Department, the coating can distribution uniform; for spraying large body surface, more rapid and effective than brushing. However, construction with spray method should also have some operating skills:

1. with clean water will be transferred to the appropriate paint spray viscosity to coating -4 viscometer measurement, the appropriate viscosity generally is 20 ~ 30 sec. As a moment not viscometer, available visual method: using a stick (iron bars or wooden sticks) will paint stir well to stir up to 20 cm height to stop observation, as lacquer in a short time (seconds) within a continuous line, was too thick; as one that is disconnected from the barrel was too thin along; to just stop when 20 cm high, liquid paint a straight line, and instantly drop down into the stop, the viscosity is more appropriate.

2. air pressure is best controlled at 0.3-0.4 MPa (3-4 kg / square centimeters). Pressure is too small, liquid spray paint bad, at the surface pitting; pressure too easy to sag, and the mist is too large, a waste material will affect the operator’s health.

3. the distance between nozzle and material surface generally 300-400 mm is appropriate. Nearly easy to sag; too far mist uneven, prone to pitting, and the nozzle away from the object plane flying mist on the way wasteful. The specific size range, should be based paint type, viscosity and pressure to be adjusted in size. Slow drying paint spray can be farther away, quick-drying paint spraying, distances of nearly 1 o’clock; nearly one o’clock when viscosity of thick, thin viscosity when farther away; air under pressure, may be farther away from the pressure-hour accessibility point ; the so-called near point is farther away, 10 mm -50 mm in a small range of adjustment, if more than this range, the film is hardly ideal.

4. the spray gun can be used for up and down, move around, preferably 10-12 m / min speed of uniform operation of the nozzle to spray straight on the body surface to minimize oblique spraying. When the spray to the body surface at both ends, the hand gun trigger button to quickly loose this, so mist reduced because the two ends of body surface, often more than twice the spraying, the most likely cause is linked to the local flow .

5. the next one to suppress when painting on a 1 / 3 or 1 / 4, so as not to appear the phenomenon of missing jet. In the spray drying paint, the need to spray a sequentially complete. Up spray are not ideal.

6. in the outdoor open space spraying, pay attention to wind direction (wind when not operating), the operator should stand on the wind direction to prevent the mist by the wind to have spray paint on a good cause unsightly granular surface.

7. spray the order is: first, the difficult first years after the outside. After high before the lower, after the first small area of a large area. This will not cause splash after the spraying of paint mist spray to have a good film, the damage has been sprayed a good film.

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