Final answer:
A protective covering, such as a fender cover or fender mat, should be placed on a fender to prevent damage to the vehicle finish during work or repairs. They are made from materials designed to protect the paint from scratches, dents, and chemicals.
Step-by-step explanation:
To prevent damage to the vehicle finish, a protective covering should be placed on a fender when working on a car or when there is a risk of scratching or denting the finish. Fender covers or fender mats, often made from soft, durable materials like foam, rubber, or cloth with a non-slip backing, are designed to provide a barrier between tools, parts, and the vehicle's paint. Not only do they prevent scratches and dents, but they also protect against potential chemical spills that might occur during maintenance or repairs. It's important to choose a fender cover that is specifically designed for automotive use, as they will generally have features tailored to securely fit and protect the vehicle's surface.