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Brian200001 I can't agree or disagree about NXT, except to say I have used it on my Black Jeep and there has been no problem. However, I will say that I have used Zaino on four cars now over a five year period and have never had a problem with the paint.
I know hundreds of people who drive Vettes and that is the only thing they have used for years, and that includes two paint engineers for GM and one for Ford (yes, Ford employees drive Vettes) that use nothing but Zaino.
I have also seen six to seven year old black/red/and even a green Vette that have only had Zaino applied and no oxidation in the paint, and I will also add these vehicles have always been in AL, TN, GA, and most were not garaged, they were like mine; driven. (Garage queen Corvettes are a different beast altogether.)
I have heard that Zymol is a great product, but I'll continue to use Zaino, with the confidence gained over the years that it will not harm my paint.
I like the idea I can apply in bright sunlight in the middle of summer. Did it all the time on my White Vette in the hot summers of TN, and it always came off easy, lasts forever, and shined like "wow."
Only problem is you can only order it from Zaino bros website, unless there is an independent in the area who sells the product, and it is not cheap.

(I always figured oxidation was caused primarily by UV rays, at least that was what I have been told by the paint experts I have met in my life. I also learned that the best way to beat UV rays is to make sure the polish/wax treatment contained UV inhibitors.)