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I have a Diamond Black 91 525i and have been detailing cars since high school(my parents cars, to earn money) and have found
Zaino Brothers to be the best for my BMW. I find it requires several applications, however the finish is harder, longer lasting and more brilliant than Mequires,Liquid Glass or Duragloss. Admittedly I have not had experience with Zymol, however balk at paying the higher price for the higher end
Zymol( not found at Pep Boys).I especially like how Zaino's finish withstands occasional carwashings. Three or 4 applications over a month or two will last a half year or more. Having said this, I have no interest in this other than having this very positive experience.
I am also experimenting with Mequires new Tire Gloss.