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I have a C292 GLE Coupe in Obsidian Black Metallic and had it professionally ceramic coated a couple of years ago. When I picked up the car, stunning, the black was very deep and the gloss looked really beautiful. However after 5 months it started to look a little bit dull, and there were some swirls, which I was reluctant to remove, as I believe any polishing actions would remove the coating layer. A top coat would enhance the gloss again but not removing the swirls.
As someone who don't mind spending hours in the garage polishing and waxing every 3-4 months, I think it is better for me to use the more conventional route of sealant & waxes as I could be much in control with the cars. I used to have a Scirocco R in Rising Blue color, used it for a good 6 years and properly maintained the paint without ceramic coatings.
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