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Are you guys referring to Aquapel Glass Treatment & Rain Repellent or Aquapel Glass Windshield Cleaner, or both?
Also what is OC?
Thanks
Opticoat works insanely well on glass and I have it on all the glass on my daily driver. Only place it will end up prematurely failing is the windshield. How long it last will depends entirely on how often you use your wipers. Mine lasted about 4 months in rainy Seattle.
Based on the OP's comments I'm assuming he's not looking for something to sheet water off the windshield, so much as add a permanent layer of protection. I personally would go to Opticoat for that.