I suppose it really depends on what color(s) you are going to use. With Krylon Fusion there are only 16 colors available, but you dont need to sand or clear coat (they are all glossy finish I believe). If you go with some other type of paint then it would probablly be a good idea to do any light sanding, if necessary, then prime and paint. Clear coat would also be a good idea to prevent scratches as well. Just my opinion. I do a lot of computer case modding / painting, but mainly work with metal and wet sanding, so process is a little different with plastics. Also take your time. Too many people want results and rush the paint job, remember that the most important thing is not what others think, but what you think. Gotta be able to look at it and say "I did a damn good job!"