Im thinking the gtechniq stuff, I hope 15ml will do the wheels once over?
http://www.theultimatefinish.co.uk/gtechniq/c5-alloy-wheel-armour.aspx?source=google-base&variant=4386
Ooo gord, I don't remember now, all I remember is that I had plenty left over
15ml apparently will be enough to do the faces, but iirc I sealed inside the barrel and the faces, then wasted however much on the polished dish (don't do this, they're bare metal so it won't stay).
Think I must have got 25ml. Really cool stuff though