What is the approximate pressure for spray painting?
2 Answers
Spray painting typically requires an air pressure of 0.3 to 0.6Mpa. Definition of spray painting: Spray paint is a type of synthetic paint made from nitrocellulose, resins, pigments, solvents, etc. It is usually evenly applied to surfaces using a spray gun, featuring water resistance, oil resistance, quick drying, and is used for painting cars, aircraft, woodwork, leather, etc. This substance is toxic and can have certain effects on the body, with toxicity varying depending on the brand due to differences in composition. Special care should be taken during use to avoid inhalation and skin contact. Precautions during spray painting: The air pressure should be adjusted according to the type of paint, temperature, and the size of the workpiece. 1K paint requires lower air pressure, while 2K paint requires higher pressure. High pressure results in smaller paint particles, smoother and flatter surfaces, but the paint is more prone to dispersion, has weaker adhesion, and higher consumption. In high temperatures and quick drying conditions, or with large workpieces, the previously applied paint may harden too quickly, affecting subsequent painting processes. Low pressure produces larger paint particles, thicker paint films, and is more likely to result in an 'orange peel' texture, with slower drying, but the paint particles are less prone to dispersion.
I remember when I painted my car before, I experimented with pressure settings. Generally speaking, the pressure for a regular spray gun is around 20 to 30 PSI, with 25 being my most frequently used point. If it's too high, the paint splatters and wastes material, plus it fills the entire garage with mist—even a face mask can't block it all. If it's too low, the coating won't be even, leading to bubbles or drips. I recommend beginners test on a small sample first and adjust the pressure based on the paint type—metallic paint might require slightly higher pressure. I also use a portable pressure gauge to monitor and ensure stable output. Once this is set correctly, maintaining a spray gun distance of 20 cm and moving your hand a bit faster will result in a much smoother coat. For routine maintenance, remember to clean the air compressor filter to prevent pressure fluctuations from affecting the finish.
