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Question posted - December 5 to December 9, 2016:

What is the effect of the wind-chill factor on the curing of epoxy and PU when temperatures are similar?


Selected Answers

From Paiboonsak Saengsomboon of JT Marketing Co., Ltd. on December 15, 2016:
There should not be any effect if the wind chill is not decreasing the ambient temperature.

From Warren Brand of Chicago Coatings Group on December 7, 2016:
Windchill only effects humans. The only thing wind does, as Tom pointed out, is to cause a surface to change temperatures faster than if there were no wind. The science behind it is simple. It's simply more air molecules, either hot or cold, able to transfer temperatures to any surface. The more wind, the more molecules transferring temp to a substrate. That's why blowing on a spoonful of hot soup works. Also, as Tom pointed out, wind can change recoat windows due to accelerating solvent evaporation.

From Tom Schwerdt of Texas Department of Transportation on December 7, 2016:
We typically ignore wind chill in the painting industry, but higher winds can cause faster cooling of freshly painted surfaces, both whenever the air is cooler than the surface (evening) and due to accelerating the evaporation of solvents.

From Bryant Chandler of Greenman-Pedersen, Inc. on December 6, 2016:
If air temperature and dew point temperature are similar, then there is a good possibility for condensation on the surface. With some epoxies, that could promote an amine blush condition. With two-component polyurethanes, that will often times effect a color and gloss change. With moisture-cured polyurethanes,  moisture on the surface can cause micro-bubbles or pinholes on thick films if the surface cures too fast relative to the coating underneath because CO2 wants to escape as the coating underneath is curing.


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Tagged categories: Curing; Epoxy; Polyurethane; Temperature


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