How does humidity affect spray gun painting and how to compensate?

Humidity is one of the environmental factors that can severely affect spray gun performance. In this article, we’ll explain how humidity influences painting results and provide tips on how to compensate for it.

Effects of Humidity on Spray Gun Painting

High humidity causes moisture to mix with the paint, affecting the drying time and leading to defects like:

• Blushing: A milky appearance caused by water vapor trapped in the paint.

• Slow Drying: Increased drying time, leading to longer wait times between coats.

Compensating for Humidity

• Increase Airflow: Use an air dryer or increase the ventilation in the workspace to reduce moisture in the air.

• Adjust Paint Mix: Reduce the amount of thinner used to prevent excessive evaporation.

• Use a Humidity Control System: Consider installing a dehumidifier in your workspace to maintain optimal air conditions for spraying.