Mag mounts according to Sirio are to be temporary. However if you keep a mag mount as a permanent fixture,periodically remove it to clean any dirt that may have accumulated and clean,polish,and put a good quality wax on the place the magmount sits. Cloth may accumulate dirt and accelerate wear on the paint. Note: If more holding power is desired providing you have a sufficient magmount and add another sheet of ferrous metal behind the panel. Extra thickness = more holding power