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Ask the Experts Paints and Coatings

I’m continuing to experience surface defects such as pinholes and craters in my coatings. Help.

Charlie Hegedus
Research Associate

Surfaces contaminated with dirt and dust are difficult to wet, and problems such as pinholes, fish eyes and craters often result when coatings are applied to such a surface. The key to effective, defect-free coverage is for the surface tension of the waterborne system to be lower than the surface energy of the substrate. Also, ineffective or incompatible defoamers can make matters worse. Choosing an efficient, low-foam dynamic wetting agent can help by wetting surface contaminants and significantly reducing the need for defoamers. Superwetters such as Dynol® 360 and Dynol™ 604 surfactants provide maximum low-foam dynamic wetting for difficult systems, and Air Products’ range of Surfynol® DF series defoamers provides a balance between foam control and compatibility.
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