When applied to metal roofing, coat­ings can perform several important functions, ranging from aesthetic to weatherproofing. They offer a choice of color, protection against mois­ture intrusion, potential energy savings, and structural enhancement, all at a reasonable cost. And they provide a sustainable, long-term option to the eventual replacement of leaky, corroded metal panels that may be covering expensive buildings and their contents. Coatings can prevent deterioration by providing a “sacrificial” layer to take the punishment that the elements and the environment dole out. Depending on the geographical location and building configuration, coatings can reduce energy consumption and improve building occupant comfort. Reducing hot building temperatures has been shown to improve productivity; and stud­ies have shown that cooler building temperatures improve the weight of livestock and reduce water consumption. Coatings can waterproof a leaky roof. Roof coatings also protect the integrity of a metal roof by reducing thermal-shock roof damage. A cool roof coating moderates the excessive thermal expansion and contraction that otherwise could lead to fastener and seal failures.