During the drying of waterborne coatings, and especially after high-speed application such as spraying, some irregularities or marked texture can arise on the surface finish. This includes surface coating defects such as craters, fish-eyes, pinholes and the waving effect. A perfect surface aspect is derived from good substrate wetting and good leveling properties of the liquid coating. These characteristics provide a continuous and homogeneous film during drying, which enables better mechanical performance. These properties are directly related to surface tension issues, especially at the two interfaces — liquid-air and liquid-substrate.