I found this in another forum. What do you think?
Beading" does not mean that the protection is there, and lack of "beading" does not mean it is not there.
Waxe products bead as the surface tension is high, good polyermer products will "bead" for a short time, but then once the petroluem distillates used as the carrier of the components evaporates, the surface tension decreases and water should "sheet" off the surface, which is why a superior polymer based product does not promote water spotting.
Plus polymer resin based products of quality contain polyaminosiloxane resins which are known in the chemisty world to be very heat resistant and "anti-corossive".
In other words, they do not evaporate easily from the surface and they aid in the warding off of air borne industrial pollutants.