Older metal counters and equipment can be professionally spray painted. Any item that is painted must be completely cleaned and degreased before priming and painting. Field-painted equipment tends to be more susceptible to scratches than factory finish. To protect the new finish, you should install new trim or bumpers along all surfaces that come in contact with carts, trays and so on. Automotive-paint supply stores stock a wide variety of easily applied trim on rolls, in many sizes and colors.