That second thread almost replicated what happened on my last C4. It was Diamonbrite coated by the dealer but, after 6 weeks the car was sprayed with road mender's bitumen, and had to be professionally cleaned. Their insurers agreed with me that, as a new car the dealer should do it, and re-coat it. When it came back, it was raining (and for a few weeks after), so it was some time before I saw it with the sun on it - exactly the same as those photos, and looked like polished with a Brillo pad. Too late to complain, and told it looked like I had used a dodgy car wash or polishing machine. Went to the same dealer a few weeks later, with a mate who was looking for a s/h car, and every dark coloured car looked like it to had been Brillo pad rubbed. It think it was a trainee polisher what did it. Had another moan, and car was examined by an "expert", who decided the scratches were UNDER the coating. So, I ended up with a car with paint protected on top, but scratched underneath. Dealer still denied liability, so ended up with rough looking car for 5 years. And the coating did not last that long, as the paint was very dull when I got rid, and had been for some years. Current Kia is 1 year old, washed with Meg's Wash & Wax, or Shiny hand wash if I can't be asked, and never polished - looks as good as the day I picked it up!