This cement coating is often used over masonary or concrete walls. A light cement coating is applied by brush or smeared over using a trowel onto the substrate. When semi firm the applicator will use either a brush, hessian bag or sponge to achieve a decorative swirled pattern. If a flatter textured finish is desired , as a feature on arcitectual homes , one should render the surface flat  prior to bagging the wall. Various textured coatings can be achieved.