stucco

a plaster now made mostly from Portland cement and sand and lime; applied while soft to cover exterior walls or surfaces

Plaster of any kind used as a coating for walls, especially, a fine plaster, composed of lime or gypsum with sand and pounded marble, used for internal decorations and fine work.

decorate with stucco work

coat with stucco

To overlay or decorate with stucco, or fine plaster.