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Small gas bubbles trapped either in the liquid phase of a paint or in the solid bulk phase of a coating are termed micro-foam. Typically, the interface between the gas bubble and the surrounding media is stabilised by a single layer of surfactant. Stabilisation of micro-foam is promoted by factors such as a high coating viscosity or low temperatures [1] [5]. For combating micro foam special deaerators are used. These are described in Chapter 7.