Coil coating is a process for coating one or both sides of flat steel or aluminum tape. Paint or plastic film is the usual coating material. The result of this process is a composite material made up of a metallic carrier material and an organic coating.
Two coats, which serve different purposes, are applied to the carrier material - the primer and the top coat. The primer is important for adhesion and corrosion protection, while the top coat gives the sheet metal the appropriate decorative quality and is available in almost any color. The gloss level and structure of the top coat can also be varied. Modern coil coating paint is usually made of polyester resins, which are cross-linked with either melamine resins or isocyanates.