What is Spatter Dash and How to Use It for Concrete Plastering

https://www.constructioncost.co/spatter-dash.html

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.