Talk to the PPG reps about your steps. They will probably suggest a sealer (like DAS1980, they have another but I can't remember the name) or primer (like NCP-250) before the base coat. They also have the time to ask you what you're painting, if it's bare metal, what kind of imperfections you're talking about and how you want the finished product to turn out. Ask for the product sheets, they're invaluable when using any new product.
I've heard of dry guide, but have never used it myself so I don't know the steps involved with it's use.