Its all in the prep. Definitely clay it all over, then polish with some decent stuff.
2 thin coats of Jetseal109 - (I used it for the first time this weekend, brilliant stuff, makes the car shine so much deeper)
Then top it off with a coat or two of Wax. I use Meguiars Techwax 2.0 and this is good, i get good beading, but AGHD should be ok. I have a mate who uses is on his Clio 172 and his beads loads!