The tell-tale sign is that the paint has a squeaky feel to it when you run your clean hand across it, much like squeaky clean glass does with a paper towel (It will actually squeak.). It was easy for me because I only put the Opti Coat 2.0 on a few panels and when I took it off and polished the entire car, all the paint had the same squeaky feel to it, including where the Opti Coat had been. Before I removed it, it felt like there was a layer of some type of protection when you rub your hand across it (just like when wax is on it). I also confirmed with the water test. Of course, if it had been on longer I may have had a tougher time.
By the way, I learned a whole lot during this whole process. I have never owned a polisher (always did things by hand), so I got really good with my new GG 6" polisher by the time this was done and I just love how easy, fast, and well it puts on wax. I also learned that the right products are very important. You can choose the wrong product and be fighting yourself, making more work for yourself, etc. The right products make the job much more easy than the wrong ones, and I am not referring to Opti Coat here. I am referring to the right polishes, pads, polisher, etc. For example, I was not having much luck with a polish I was using, and then someone on here told me to go with Meg 205, and I really love how well it works. Like a lot of things, there is nothing like on the job training to get good at something, and I got a pretty good amount of job training doing this with tools I had never used before. Of course, I am only doing this for my own personal cars. I won't be getting into the detailing business or anything.
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