Even though the wax I use still beads after a month, the paint sure as heck don't look as good as it did a month before. It's single stage paint, 4 and a half year old insurance paint job. Ford ZR Ultra White. Every time it gets dirty, it's as if some of the dirt , grease or bug stuff gets stuck in to the paint. Like a stain. And the only way to removed this "stained" dirt is by using very aggressive scrubbing or using rubbing compound. Forget the shine, the paint starts getting a yellow tinge and the surface becomes more foggy looking. No wax or polish prevents this. I can clean it up till it's factory ultra clean white, toss 5 coats of wax on it and still, within a couple weeks the paint gets the dirty yellow tinge and foggy look. The longer, the worse.
My paint has seen much better days. Just the other day I was washing it and a big chip of paint just flaked off the bottom of the fuel door. It was peeling from the under side. Now there's a splotch of grey primer with a slight orange hue in certain spots. Rust I say, No wax in the world's gonna save this paint now ..hmm