The environmental conditions during pre-treatment and application of a coating system are major factors affecting the long-term performance of coatings on steel structures. Meters can be used to monitor environmental conditions before, during and after painting. Ideal for surface preparation as required by ISO 8502-4, an electronic Dew Point Meter determines the likelihood of dew forming on structures which are being painted.

Why Environment Important ?

Temperature, humidity and related climatic parameters are important to many industrial processes and the application of paint and coatings is no exception to that rule. Measuring and controlling climatic parameters such as relative humidity, air-temperature, dewpoint and moisture is vital to a successful application of high-end coating systems. Incorrect climatic conditions during pre-treatment and application often lead to premature failing of coatings systems.
Temperature and relative humidity during application
Most two component epoxies require a relatively high temperature (often more than 15°C) combined with a low relative humidity. Moisture curing coatings need a high humidity level in order to cure. Water based coatings cannot be applied at very low temperatures and too low humidity causes the paint to dry too fast while a high humidity slows the curing process down. Surface tolerant coatings accept a wider range of climatic conditions and some coatings can even be applied underwater.


The term “Moisture is often confused with “humidity”. Humidity or better relative humidity is defined as the ratio of the partial pressure of water vapor in the mixture to the saturated vapor pressure of water at a prescribed temperature.” Products to define humidity and other climatic parameters are presented in our section Climatic Conditions.

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