Dew Point

Understanding Dew Point

Dew point is the exact temperature at which moisture condenses on any given surface. It is the temperature at which the surrounding air can no longer contain its moisture, and the excess moisture condenses into a liquid such as condensation, fog dew, or other forms. Coatings should only be applied to a surface if the surface temperature is at least 5°F above dew point. When this isn’t done, surface imperfections such as blistering, delamination, and loss of adhesion can occur. When inside, using dehumidifiers and heaters will help you manage the temperature and humidity levels.

EXAMPLE
If the air temperature is 90°F and the relative humidity is 45%, then the dew point is roughly 65°F. In this case, coatings should not be applied unless the surface temperature is at least 69°F.

Dew Point Calculator

Dew Point Calculator