I wish the market info would use MUST use blackfire prep or you will experience failure
It says 'need'. AG provided decent instructions and can't address every scenario where people don't follow the instructions they provide.
Quote from the AG page for BlackFire Crystal Coat:
BLACKFIRE Crystal Seal Paint Coating couldn’t be any easier to apply. First, wash the vehicle using BLACKFIRE Wet Diamond Conditioning Shampoo, and then clay it to remove above-surface bonded contaminants such as paint-overspray, industrial fallout, bugs, and tar. Next, polish the paint to remove any swirl marks or scratches. Once this has been completed, you need to cleanse the paint of polishing oils by using BLACKFIRE Crystal Coat Paint Prep. This step is key to success, because any type of polishing oils, finger prints, or other surface contaminants will prevent the coating from fully adhering to the surface.
I had the same concern with CQuartz, They suggest the use of Eraser before coating. I have always used IPA wipe downs, but instead of risking issues and wasting my time I bought Eraser (even know it is IPA based). Sometimes these prep products are not needed, sometimes they are. It's hard to know when, but I have decided that my time is worth more than the money wasted on potentially unneeded, yet manufacture recommended products when it comes to coatings.