Sand and cement rendering is a traditional method of applying a protective and decorative finish to exterior walls. The process involves mixing sand, cement, and water to form a thick paste, which is then applied to the wall using a trowel. The mixture is smoothed out to create a flat, even surface that is both durable and visually appealing. The render is typically applied in two or three coats, with each coat being allowed to dry before the next is applied. Sand and cement rendering is often used on older buildings, as it can help to protect the walls from the elements and improve their overall appearance.