Pinholes constitute a common defect with many possible causes. Pinholes occur in waterborne and solventborne coatings, air dry and baked coatings. They all have small diameters or they would not be called pinholes. Many of them are deep; some of them are shallow (see Figure 1). Some of them are small solvent pops; others are small craters. Many of them originate in the coating where they appear, whereas others stem from an underlying coating or even the substrate.
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