What is the correct technique for automotive spray painting?
1 Answers
Correct techniques for automotive spray painting include gun adjustment, gun handling, and gun movement. The details are as follows: 1. Gun Adjustment: Before spraying, the spray gun and related equipment should be clean and in normal working condition. Check whether the spray gun produces an ideal spray pattern. The ideal spray pattern should be symmetrical, with uniform particle size distribution and clear edges. Only a small amount of overspray should exist outside the edges of the spray pattern. Lower atomization pressure helps achieve a correct and uniform spray pattern, reducing bounce-back and overspray. 2. Gun Handling: The correct spraying path should remain perpendicular to the workpiece surface. During spraying, the distance between the spray gun and the surface is generally 15~30cm, depending on the angle of the surface. For a wetter, darker, and thicker coating, the distance can be closer; for a drier, lighter, and thinner coating, the distance can be farther. 3. Gun Movement: Gun movement includes the angle of the spray gun relative to the surface and the speed of the gun. The spray gun should be kept at a right angle to the surface and moved parallel to it. The movement speed of the spray gun is generally adjusted between 30~60cm/s and should remain constant. If the spray gun is tilted and moved in an arc or at varying speeds, an uneven paint film thickness will result, leading to streaks and blemishes. If the movement speed is too slow (below 30cm/s), sagging is likely to occur.
