Stucco or render's a material made of an aggregate, a binder, and water. Stucco's applied wet and hardens to a very dense solid. It's used as a coating for walls and ceilings and for decoration. Stucco may be used to cover less visually appealing construction materials such as concrete, cinder block, or clay brick and adobe. Composition The difference in nomenclature between stucco, plaster, and mortar's based more on use than composition. Until the later part of the nineteenth century, it was… (More on Stucco)