Everyone, especially people who love washing and waxing their cars, has been telling me about the long-term benefits of regular waxing. They tell me that the layer of wax acts as a protective shell and will prevent contamination (such as UV radiation, bird droppings, tar, etc) from "burning" into the car's paint. As a consequence the car's paint would keep it's good looks longer, and ultimately the car would even have a higher resale value.
I find that hard to believe. I don't know anything about chemistry so probably my thinking is not making sense at all, but the way I see it is that car waxes contain a number of natural and less natural ingredients but basically I think every car wax is in fact just grease. So you put a layer of grease on you car, which indeed makes it shine more and causes water to not stick as much to the paint. But I have a hard time believing that this thin layer of grease is going to cause any long-term beneficial effect. I bet if you wash the car regularly, that after 5 times the wax is simply gone and even if it does stay on the car, can this really have a significant protective effect? If yes, I would like to understand how.
The problem I have is that everyone who is telling about the benefits only refers to personal experience. Is there any real scientific and independent test result that proves these claims?