I see what you mean Corey. All I mean is that a freshly polished and waxed car will bead up. So then the customer will think since it's still beading up 6 months down the road it's still waxed and still protected from the elements. Which is so not true.
I should have better explained the windshield example,I meant that people don't normally wax windshields and they bead up.
As there is some kind of oils or such in glass cleaner to increase opictal clarity among other reasons that cause this to happen.
The thing is, it's hard to tell when the wax breaks down and is now longer protecting the finish. The oils used in polishes and even car wash soaps can help the car too bead up with no UV protection from the wax that was applied 6 months ago.
So how do you tell if its still protected?
Then you have cars that don't bead at all. Kind of the water wetting action, just looks like on big sheet of water on the car. You know there is no wax or anything on it. I'm not talking rinsing after you just soaped it, but during a rain shower and still no beads, you know there is no oil on the surface from a polish or such, but its not clean either.
All in all when a car is properly maintained that call will bead up from the wax (some waxes do sheet) and polishes on (in) the paint. But when does the wax start to fail, that was the reason for the example in the previous post using sunscreen. You really don't with the normal eye, just trial and error. I"m sure you could run lab test, but thats not in the real day to day world. Wax is the main UV protector for paint and just a step of a series of steps to totally protecting and replenishing your paint to keeping that new look to it.
This is just my thoughts and knowledge that I have learned,
Chubs
:rofl