https://www.ultratechcement.com/home-building-explained-single/how-to-do-a-wall-plastering - Wall plastering is the process of applying a layer of cement plaster on walls and ceilings to create a smooth, even, and strong surface. It improves the appearance of the wall and protects it from moisture, cracks, and weather damage. Proper plastering also helps paint and wall finishes last longer.