I tried this wax on my car and am very impressed with the shine, ease of application and durability (so far).

http://www.collinite.com/auto.htm

I used the #845 Insulator wax down on the page. It was the only thing that really worked well to bring back the finish of the lower cladding on my 300SD, as well as a super shine to the paint. Not great on chrome, but not bad either. The water not only beads, but literally runs off the car.

I have been using Colonite for about 20 years on my daily drivers and have to second your opinion. Not only does it protect, is easy to use and best of all does not leave that powdery mess when you remove it.