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I found ceramic coating takes a lot of time: how you wash the cars, the water you use, where you park temporarily, where you store the car, the towels and products used...etc.
What ceramic coating are you using?
What you state here sounds to me as Exactly some of the reasons to Get ceramic to start with.
Before I decide to do the full PPF of my car, I just want to do the front only to save $. But then when my car was parked, some big 4 X 6 with about .250'' thick flied acrossed my trunk and over the gas cap, leave a long 8 inch'' scratch and little bit deep. I decided to do the full car. Luckily the installer able to buff out the long sratch.