The process by which prepainted aluminum is created is called coil coating. It is how the coating material is applied to the strip. A coil of metal sheet is continuously fed into the process which is controlled via accumulators at each end of the line. They take in a bare coil of metal at one end and let out the finished product on the other end. In the middle, the coil coating process is applied. Prepainted aluminum can be found in a multitude of household products like refrigerators, to air conditioners, to construction material.