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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. What do you recommend?

Charlie Hegedus
Research Associate

Surface contaminated with dirt and dust are difficult to wet, and problems such as pinholes, fish eyes and craters often result when the coating is 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. Additionally, ineffective defoamers or those that are incompatible can contribute to these defects. Choosing an efficient, low-foam dynamic wetting agent can help resolve these problems by wetting surface contaminants and significantly reducing the need for defoaming agents. Superwetters such as Dynol® 360 and Dynol™ 604 surfactants provide maximum low-foam dynamic wetting for very difficult systems, and Air Products’ broad range of Surfynol® DF-Series defoamers provide an optimized balance between foam control and system compatibility. We recommend selecting a defoamer designed to perform best in your particular application. Please refer to the application pages for these product recommendations.
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