Chaps, if you are interested in P21S try getting the kit if you havent tried it before. On the Leon Cupra boards, I got a kit for £35 which inc wax, polish, wheel cleaner, shampoo and applicator pads. With the wax costing £20, its not much more and gives you more products to play with. Sorry no direct link though, this was a while ago.
That reminds me, if people are getting swirls from P21S wax, it may be the applicator pad causing it. It doesnt seem the softest thing in the world if people arent gentle with it. My Leon has had no problems with it as I've had it from new and cant see many swirls.