First of all, I think the term "synergy" is misused. Synergy describes how two or more things when combined have an effect greater than the individual sum of each product. So, CarPro essence and CQuartz may be complementary, but I don't see how the two would be synergistic.
I don't believe in the claims of synergy. Sure, products may be complementary, but that doesn't mean that when using the two together that the results will consistently be better than a hybrid approach. I think this is the case for the majority of products out there. Frankly, I find that to be a marketing ploy to get consumers to stay within a product line. I don't find that objectionable, and it's perfectly reasonable to stay within a line because of ease of use, familiarity, etc. Hey, welcome to Business 101. However, to claim that you can't or shouldn't mix product lines is silly. That's my humble opinion. There are so few objective tests that compare the synergistic or complementary use of products vs. the results of using two different lines of products.
In my own case, I think Gtechniq Panel Wipe works better than IPA, Eraser, Gyeon prep. So, I use it before applying coatings of all types.
I'll use Fg400 and then finish with Rupes or with HD. I work with whatever it takes. Of course, for a long time it was always FG400 and then SF4000 and then Powerlock. It was easy, but I can't say the progression produced better results when compared to using a mix of lines.
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