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The coating process involves the application of a fine, evenly applied layer using a substance which changes the qualities of the original product. The range of applications is broad, and can include altering an object's colour or shine, protecting it against light, moisture or wear as well as improving lubrication, masking taste, enhancing solubility (depending on the pH level) or allowing the release of certain active substances.

To enable the surface to be covered, the coating substance's particles must be made smaller than the grain size of the starting product. An even application to the surface will influence the desired effect, as will the coating thickness.

The coating substance is an element of the coating fluid and is sprayed onto the product particles evenly in fine droplets.

During this process, the droplets wet the particle and blend together on its surface. The liquid content evaporates, and the coating material hardens. This process is repeated during spraying. Once all the liquid has evaporated, the particle is left with a finished coating. The size of the particle to be coated plays a key role when it comes to selecting a suitable process and spray technology.