The base material for the coating is Copper in any form. The coating is carried out either chemically by etching (steam coating with NaOH) or thermally by heating (Fire Coating by gas burner). During the coating process "gaps between the [outer most layers of Copper] atoms" are created. The coating is often referred to as Nano-coating, the layers of which build up during the process of the creation of the coating. The following video explains Nano-layers in details:
Do not use Aluminium in any shape or form in your Nano-coating process!