the provision stuff is amazing mate. you dont even need windsceen wipers on when its raining. i didnt believe it until i saw it.
A really good wax will repell water aswell mate.
Just my 2p Jamie!
This is sad, but I put the wax on about three weeks back because I couldn't sleep and wanted to see how good it would repel rain when not driving
Technically you are claying, polishing, sealing . . . just like paint
Rain-x! Standard