ive seen the result of improper use of clay(whole bunch of light scratches) i have used it myself it works great for cleaning the surface and if you keep up on kneading it stays fresh. in my experence in using it on fresh paint it doesnt add anything but an un desired step that doesnt increase the shine or make anything easier. it does work very well taking overspray off but i painted jlee's whole car at once with a slow reducer and i can assure you overspray isnt an issue on josh's car! but the short of it all is that i care for that paint so its not gonna get clayed 
