Had CQuartz Finest done on my 2016 M4 (Black Sapphire Metallic) when it was new.
2+ years and still going strong, great stuff. I wash using Carpro "Reset" and quick detail using Carpro "Reload".
You can see the the result from my little picture on the left, like a dark mirror.
On the M5C that I should received soon, I will make an attempt myself with CQuartz UK and CQuartz Gliss.
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2019 - M5 Competition
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