You can opt for a glass coating, which is also basically a wax but is quite expensive.
Your options are ( in priority):
1. Collonite 845, lasts very long and gives a great shine.
2. Meguairs ULTIMATE wax (liquid shines and beads better, solid lasts longer)
3. Meguairs Gold class Carnauba wax (shines better than Ultimate, and is cheaper to, but doesn't last and bead that good.)
4. Formula 1 wax (shine is average and beading is amazint,but doesn't last that long. Hard wax should last 1.5 months and liquid 3-4 weeks)