Calling BS on the shop. Use adhesion promoter, like they said. I like the 3M stuff. There is a readily available brand called "Bulldog" that will work in a pinch.
Flex additive changes the hue and darkens paint color. Matching paint on bumpers is hard enough let alone adding that to the mix. I don't know many good body shops who will use it unless they HAVE to. I have not seen a need to use it on any B6 part. Flex has nothing to do with adhesion, and nothing to do with helping from rock chips. Flex is only there to get pliable parts back on to a car. Once the paint has cured, the flex ain't "flexy" no mo. It is a common misconception that it stays pliable over time. It's only designed to be bendable for about 72 hours.
Painting lowers yourself isn't that hard of a gig, and the nice thing about it is that it's not a good sight line to see flaws. Good way to pop your body painting cherry.
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