With the better chemicals of todays era, the baked on finish really isn't needed, only to speed the drying if need be. I said erlier that powder sucks, although liquid coatings are generaly glossier and you also have more color options for lower costs, powder is good if you are mainly concerned about durablity and not bling-bling . Also nolageek I would stay away from sandblasting unless your local sand blaster has a lower pressure machine or has a different media than sand. Sand blasting will usually leave pits in the metal witch are very hard to fill without lots of primer and sanding. Also I said in another post that your old paint is better than primer, just smooth out any scratches and then spot prime only those areas. resand and your good to paint. Remeber light coats are better but don't go to many, better to just go until your color is solid then put a thin coat of clear over that. To thick or to many coats makes the paint esier to chip and harder to touch up.