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Apologies for digging this older thread up, but I'm in a similar situation to the OP on my new M4 (Mineral Grey). I'm having to decide between Opticoat Pro+ or Gtechniq Crystal Serum Pro/Exo.
From my research I'm finding that the Crystal Serum gives a superior shine but doesn't have the longevity of the Opticoat. Am I on the right track? Is there a discernible difference or is it one of those things that you need to look hard to see a visual benefit of the Crystal Serum over the Opticoat?
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2017 BMW M4 Competition - Mineral Grey
2009 BMW 135i - Titan Silver - SOLD
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