Protective finishes are coatings applied to surfaces to shield them from damage, corrosion, and wear. These finishes can be found on various materials, including metals, wood, and plastics. Common types include paints, varnishes, and sealants, each designed to enhance durability and appearance while providing a barrier against environmental factors. These finishes are essential in industries like construction and manufacturing, where they help extend the lifespan of products and structures. For example, powder coating is a popular method for metal surfaces, while wood stains protect and enhance the natural beauty of wood. Proper application and maintenance of protective finishes are crucial for optimal performance.