Does it just look dirty and dingy or does it look out dated? If it's just dirty and dingy you may want to consider doing some type of power washing to it instead of painting. Once you've painted it that's it, you can't easily remove it. If you do decide to paint it then make sure you clean it first to get the primer to stick (need to do this first) and then go ahead and paint it. Good luck! Hug 'n hammers, Heidi