Leaning over a vehicle's body panels with tools in your pockets will quickly scratch the paint. Belt buckles, zippers, and tool trays can easily leave deep gouges on the glossy clear coat. A fender cover is a protective barrier that drapes over the fender panel. It is usually made of durable vinyl with a soft non-slip backing that clings to the car's body without sliding.
Many modern covers feature built-in magnets or suction cups along the top edge to hold them securely in place on metal bodywork. Some also include small tool pockets to hold your wrenches and sockets within easy reach. Wipe the fender panel clean before placing the cover. Any dirt caught between the backing and the paint can act like sandpaper under the weight of your body.