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I have had both CQuartz Finest and Opti-Coat Pro done on numerous vehicles. Both are great, but the CQuartz had a bit more of a hydrophobic layer I feel like.
I will be doing GTechniq Crystal Serum Black probably this time around. I like to see/compare various products. My really good friend is my local go-to guy for detailing/coatings/PPF and he has graduated from Opti-coat->CQuartz->GTechniq over the years. Between him and his partner, some of the best looking paint I've ever seen on a car - hands down.
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