![]() ![]() How do Environmental Conditions Affect Coating and Paint Performance? Air and Surface Temperatures Dew point temperature should be compared to the surface temperature to ensure the two are far enough apart that moisture formation is unlikely.Ĭareful observation of atmospheric conditions and a good understanding of their impact on the quality and long term health of coating and lining applications are important to all contractors and inspectors. Tests should be performed to calculate the dew-point temperature before, during and after the coating process. Rather than detect this moisture, instruments are used to help assess the risk of moisture forming in the first place. Light condensation on blasted surfaces can be difficult to observe. Trapped between a coating and a substrate, moisture will likely cause the applied system to fail prematurely. Moisture will cause unprotected steel to rust. Moisture forms on a surface when warmer, moist air comes into contact with it-a process called condensation. Less understood is the impact surface moisture has on the life and performance of materials. It is commonly known that most coatings will not dry properly at low temperatures and high relative humidity (RH). The difference between the surface and dew point temperatures.A variety of instruments are available to measure the five conditions that should be observed and tracked: Surface preparation and the application of coatings and linings should be performed under optimum environmental conditions to help prevent failures. It also covers several mechanical and electronic measuring devices and discusses proper use of each instrument. This article presents the five environmental conditions that should be observed and measured and the effect each condition has on a successful job. Optimal environmental conditions are essential for surface preparation, application, and curing of coatings and linings to maximize successful performance. Why is it Important to Measure Environmental Conditions before the Application of Paints and Coatings? David Beamish, DeFelsko Corporation Originally published in: Materials Performance (February, 2004) Coatings & Linings Section Updated: October, 2021 ![]()
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