I've just done a full clay on a Mk2 GTI for a good mate of mine, in black, that looks like it hasn't been cleaned from new. Seriously!
I have 4 diff types of clay as I have OCD (my missus tells me), so cracked open the Megs box version with QD. Well using about half a bar and about a third of a bottle of the Quik Detailer, the paints as smooth as glass, door shuts and all. Oh and did the glass with the used bit afterwards.
If you use this and it streaks, doesn't clean the paint or some other gripe, you need to either do it in the shade, warm the clay or change your technique!
It works fine and is very easy to get on with, hence good for people trying out clay for the first time.
I personally prefer the Zaino clay, Z18, its a great product and I lube with Megs Last Touch watered down 3:1 - water to lube.
