I clay by hand. I buy a lot from Griots and I have the PC, but man if you don't keep the car lubed I can't imagine what kind of marring you'd get from that yellow clay. I'm glad to hear you've had good results with it. That bonnet with the hole in it for the clay always looked a little suspect to me, though. I clay by hand, polish with Zymol Liquid Clay, and two layers of Zainos followed by Finishing Spray by Griots. Stunning!