The colored coat is sometimes referred to as the base coat. This is a layer of paint that holds the color in which the panel is to be painted. This layer covers the primer and is usually finished with a layer of clear coat.
The primer coat is used between the material the panel is made from and the layers of paint that will follow. In some cases there can also be filler underneath to make sure the panel is perfectly flat and smooth before starting to paint.
Paint is a layer of coating applied to a surface in order to protect it from the elements, or for cosmetic reasons. Although the type of paint can be different, the layer of paint will still have a certain paint thickness.