NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO! ::takes a breath:: NOOOOOOOOOOOOOOOOOOOOOOOOOOO!!
Clay by hand is far superior than claying with the PC. One piece of grit on the finish or clay will make lots of marks onto you're finish. Claying by hand is much easier and faster. You will have to remove the clay and knead it and put it back on. You also loose *feel* of the clay and how well it is working if you use it with the PC.
I would return the power clay system.
The Clay Magic 200 gram blue clay is great stuff. I tear off a small piece (about the size of a silve dollar) and clay, once it gets dirty or it slips out of my hand, throw it out and tear off a new piece. Mcuh better IMHO, because once you drop the entire clay bar (200grams) its toast.