Anybody not using undercoating?

There isn't a reputable body/restoration shop in the world using POR-15, Chassis Saver or any other "magic paint" to protect metal, because those paints don't protect metal. What they do accomplish is trapping moisture between themselves and metal, causing rapid rust-through. I've seen the damage they can do in two years; it ain't pretty. Avoid them like the plague. Quality primer and quality paint is all the protection you'll ever need. Undercoating is just a bonus, although I consider it mandatory in wheelwheels--just to dampen the sharp whack of stones on sheetmetal.