Is the air pressure the same for 1K and 2K paint spraying?
3 Answers
Spraying 1K and 2K paint requires the same air pressure. Spray painting air pressure: The normal air pressure for spray painting is 0.3~0.6Mpa, whether it's 1K or 2K paint spraying, the air pressure falls within this range. Therefore, the air pressure for 1K and 2K paint spraying is the same, with no difference. Definition of air pressure spraying: Air pressure spraying is a type of spraying method. It involves atomizing the paint with compressed air and spraying it from the nozzle onto the substrate (plastic or other materials). This method is suitable for coating porous materials and substrates that should not be penetrated. Spraying can be further divided into suction-type spraying and pressurized air spraying.
The air pressure settings for 1K and 2K paints are not always the same. From my experience, 1K paint is thinner, so a lower pressure setting around 20 to 25 PSI is appropriate. This results in a thin coating that is less prone to bubbling or material wastage. 2K paint is more viscous and requires higher pressure, around 25 to 30 PSI, to ensure even atomization and mixing. Otherwise, the coating may become rough and prone to peeling. Air pressure is also influenced by environmental factors; for example, slightly reducing pressure in high temperatures can prevent overly rapid drying. It's advisable to adjust according to the instructions on the paint can before each spray session and test the spray pattern on a scrap board. The nozzle size, such as 1.3mm, also affects pressure selection. Beginners are recommended to use a compressor with a pressure gauge for real-time monitoring to avoid mistakes. In short, being flexible with pressure settings and fine-tuning based on specific conditions is key.
After personally spraying car paint several times, I noticed a significant difference in air pressure requirements between 1K and 2K paints. I used to mistakenly think setting both at 25 PSI would work, but the 2K paint came out with large particles. Later, I learned better: lowering the pressure to around 22 PSI for 1K results in smoother application, while increasing it to about 30 PSI for 2K ensures even coating. However, this isn't absolute—paint brands vary greatly in viscosity, so always check the label instructions. I also believe spray gun type matters; smaller nozzle diameters may require slightly higher pressure. My advice is to adjust pressure while working rather than sticking rigidly to one setting—this saves paint and achieves a glossy finish. Don't forget safety: ensure proper ventilation and wear a mask, as 2K chemical fumes are harsh. With a few tries, you'll find your ideal rhythm.
