Stucco or render is a construction material made of aggregates, a binder, and water. Stucco is applied wet and hardens to a very dense solid. It is used as a decorative coating for walls and ceilings, exterior walls, and as a sculptural and artistic material in architecture. Stucco can be applied on construction materials such as metal, expanded metal lath, concrete, cinder block, or clay brick and adobe for decorative and structural purposes.
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In English, "stucco" sometimes refers to a coating for the outside of a building and "plaster" to a coating for interiors; as described below, the material itself is often little different. Other European languages, notably including Italian, do not have the same distinction; stucco means plaster in Italian and serves for both.