When waxing my D, I usually only wax the front and back portions of the roof not the part between the roof rails
Thats the truthYup, wax it even if it is only once a year. It will not take too much time for the roof paint to get stains and the clear coat to fail. An hour's effort every 364 days is a great tradeoff against a $1000+ repaint job later.
Can I make a appointment with you for my rango ?Not only do I wax the entire roof, but I paint correct it and seal it!! OCD anyone!
Most but not all of those are good for a few weeks protection. It is hard to say if it is good or not, but if the water beads readily you can assume that the protection is still valid enough. I would never rely on that sort of product for true protection, more like "touch-up" or maintenance of a job already well done.What about the wax/ sealer products at a good car wash once a month?