To keep the shine you must prevent oxygen from getting to the copper. After cleaning the copper you must remove all traces of cleaner, dirt/grease transferred from your hands and any other contaminates. I wash the cleaned pieces with soap and water and then dry the pieces with paper towels. I then move the pieces, holding them with paper towels, to the area that I do spraying. Spray with clear lacquer and when dry, spray a second coat. After that you should be good for a lot of years.