Use Zaino Bros. & clay on black VW Jetta. When used w/Zaino scratch remover (can't remember number) the paint looks deep. All the scratches and swirls that come from winter washing are gone. Used Permashield on truck. Did a pretty good job. Next time will do it after clay bar. Hard to compare as truck is driftwood and doesn't show swirl marks, etc as black does. Nice thing about using non carnuba is the time between applications. Most carnubas are gone after 3 to 4 washings. I have a lot of things to do in a limited amount of time. Constantly waxing vehicles is not one of them.