The Oil & Gas industry and the Automotive industry also use this coating.
The bare coating, with no supplemental sealing or treatment, will not be corrosion resistant for very long on its own. From experience, flash rust appears on the surface in less than 12 hours.
Heavy-grain is a heavier or thicker coating and it is capable of retaining supplementary oils and waxes better than fine-grain. Fine-grain has a finer crystal structure that serves well for subsequent painting.
It is predominantly applied to steel as well as zinc surfaces and less commonly applied to other metals.