Fine stuff mixed with sand is used for the setting coat.

The third and final coat is the setting coat, which should be about 1/8 inch thick.

The finishing or setting coat is about 3/16 inches thick, and is worked with a hand float on the surface of the rendering, which must first be well wetted.

The slabs may be obtained either with a keyed surface, which requires finishing with a setting coat when the partition or ceiling is in position, or a smooth finished face, which may be papered or painted immediately the joints have been carefully made.