Why is it important to sand wood before finishing?

Sanding wood before applying a finish is crucial because it creates a smooth surface that promotes better adherence of stains, paints, and finishes. A rough or uneven surface can lead to poor adhesion, which may result in peeling, chipping, or an inconsistent appearance of the finish over time. Sanding also removes any imperfections, such as splinters or rough patches, ensuring that the final application looks clean and professional.

While highlighting natural wood grains, removing old paint, and preparing wood for cutting are important aspects of woodworking, they do not directly relate to the primary function of sanding before finishing. Highlighting grain may be a benefit of the finishing process itself, and removing old paint typically requires different techniques. Preparing wood for cutting is focused on achieving accurate dimensions rather than achieving a surface suitable for finishing. Thus, the emphasis on creating a smooth surface for optimal adherence is what makes this process essential for achieving the best results in woodworking.