The purpose of Spatter Dash is to prevent rendering and plastering materials from sliding or sagging. A spatter dash's roughness enhances bonding by providing a positive key for the plaster to grab onto. The improper use of spatter dash involves successively bonding rendering to the substrate.
Plastering is accomplished using a key or an even amount of suction. A bonding agent is added to sand, cement, and water. A surface is prepared by throwing spatter dash on it before plastering begins.
A spatter dash is a finish for stucco created by dashing a very thin mixture of cement and coarse sand against a fresh surface. The spatter dash does not have to cover all parts of the surface, and not protecting some parts is in fact beneficial. Surfaces such as scatter dash and pebble dash are achieved by throwing mortar or pebbles on the finish coat while it is still weak.