there are 3 stages - the first takes away any blemishes in the paint - ie swirls, stains from bird mess etc, the second polishes the paint to an amazing shine - the third then contains the carnuba wax - Halfords now sell all 3 - they are in red bottles and are marked stage 1,2 & 3.
It takes a good days work and your arm will hurt like fuc* afterwards but you will be well chuffed with the results - it takes a lot longer now for the car to get dirty as well - the dust etc does not seem to stick so much.
usual story - hurts like hell (especially as £10 a bottle) but well worth it in the end.