What is the primary function of a psychrometer in painting and coatings?

The primary function of a psychrometer in painting and coatings is to determine relative humidity and dew point. This information is crucial in the painting process, as humidity levels significantly impact the application and curing of coatings. High relative humidity can hinder the drying and curing of paint, leading to issues such as poor adhesion, surface defects, or mildew growth. The dew point is particularly important because it indicates the temperature at which moisture begins to condense. If the surface temperature of the material being painted is below the dew point, condensation can occur, which can negatively affect the coating application and performance. Therefore, using a psychrometer helps ensure that environmental conditions are suitable for optimal painting results.