To cover rust around a car wheel well, the first step would be to thoroughly clean the entire rust spot and the area around it with soap and water. Next, you would need to sand the surface until it is smooth. Then you can use a rust converter to neutralize any traces of rust. Alternatively, you could use high-grade paint over the area after sanding off any remaining rust and dirt. A clear topcoat or primer may also be applied over the area for extra protection from new rust formation. Finally, if you want an even more permanent solution, you can install a plastic flap or sheet of metal to cover the whole well for complete coverage of the rusted area.