Tom,
Something that I should have asked you, way back at the beginning of this Thread - what is your tolerance to not "perfect" Jet Black Paint ???
If it does not have to be "perfect" every time you look at it, then this will not be hard to figure out what you want or need to do here..
Dealer applied Anything - in my experiences - Never any history, specific details regarding the product, A Lot of Flashy Brochures, etc.,
My biggest question - How often does my car have to come back to have this re-applied ???
2nd biggest question - Who is going to be doing this and how much experience do they have ???
3rd biggest question - How come I have to keep coming back at least once a year for this, and why do I get charged more money each time ???
If you are ok with having to go back and forth to a place where really Experienced Detailing is NOT always if ever available, then the Dealership may be a good place...
If you want to work with your car paintwork and learn along the way, it is possible to accomplish this, but it will not be easy as looking at a YouTube Video, and now think you are experienced..
I personally would still put a good coating on the perfectly finished paintwork, and be done with worrying about how the paint is going to look because it will be under the coating, and the hardness of the coating will be more than the paintwork sans coating..
I have a couple of Jet Black M5's on my website that came in so scratched, they looked like a very dirty dark gray color, and they left looking like these rolling black mirrors, absorbing all light including the sun around them..
So, at whatever level of tolerance you decide you want to have for this stunning color, there will be a solution..
You will be fine...
Merry Christmas !
Dan F