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A quarter panel (British English: rear wing) is the body panel (exterior surface) of an automobile between a rear door (or only door on each side for two-door models) and the trunk (boot) and typically wraps around the wheel well. The similar front section between the door and the hood (bonnet), is called a fender, but is sometimes incorrectly also referred to as a quarter panel. Quarter panels are typically made of sheet metal, but are sometimes made of fiberglass, carbon fiber, or fiber-reinforced plastic.
A quarter panel is typically a welded-on component of the unibody structure. Replacement of a sheet metal quarter panel typically requires it to be cut off the vehicle and a replacement part to be welded (or sometimes bonded) to the vehicle. Due to the high amount of specialized labor, a quarter panel may often be repaired rather than replaced by hammering the damaged area to a relatively flat surface and then applying a body filler to smooth out the damaged area to match the original surface. The panel is then usually painted and often clear coated.