How good it looks and lasts depends greatly on how good a prep job you do. Sand the imperfections and rough spots using progressively finer grades of sandpaper until they are perfectly smooth. Clean it all with liguid dishwasher soap and water and then use rubbing alcohol to clean it again. Use the Duplicolor prep spay and follow the directions. Make sure that the temp in the space you are working in is above 70 degrees, or the mositure may condense out on the parts as they dry. Prefect prep makes for a perfect finish.