Wall putty is a versatile material used to create a smooth surface on walls, fill cracks and holes, and prepare them for painting. It offers improved protection against stains, mold, and cracks and is suitable for both interior and exterior surfaces. Different types of wall putty, such as white cement-based and acrylic variants, offer varying binding qualities and applications. The process of applying wall putty involves moistening the wall, mixing the putty with water, applying it with a putty knife or trowel, and allowing it to dry before sanding and wiping it clean.