Coil coatings, also known as pre-painted steel or pre-finished steel, are polymer coatings applied to steel or aluminum strip prior to fabrication. The metal is continuously coated in a roll-coating process and once dried, is coiled for storage and transport. This allows for large quantities of pre-painted metal to be easily handled, shipped and stored before use. After pretreatment, the strip enters the coating application zone where liquid paint is applied. Three common coating techniques used include roll coating, spray coating and curtain coating. Roll coating involves applying paint via a set of rolls, one of which is flooded with paint.

In the Coil Coatings process, the steel or aluminum strip is first cleaned and any oxide layers are removed. This prepares the surface for optimal paint adhesion. The strip then passes through a series of treatment tanks where it is exposed to chemical solutions that condition and enhance the surface. Phosphating is a common treatment that converts the metal surface into phosphate crystals, providing an anchoring layer for the paint.

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