I liked the results of the F11 top coat, but, since it's water based, I think, it didn't last in the rain. It did a good job getting rid of the "swirl" marks on my black truck, but, by time I got home from Texas, the swirl marks were back. After two coats, it only took a couple of good rain storms (one in Colorado and a short one in Texas) to allow the swirls to come back
I do like it for a quick clean (waterless so you can do it when it's chilly), but, if your looking for protection, I'm not impressed. Maybe if you get a large build up it would be okay. . It really makes the black pop. I've been wondering if I waxed it while it was popping, would it stay?