I'm not a fan of paint sealants.
I do what I've always done, I use Zaino.
It costs less $100 to buy the whole system (Good for many applications).
I first got the Zaino while owning a 35th aniversary Special Corvette and have been using it ever since.
You start with claybarring (Which is easy), even on a new car
Then just follow the instructions on the site
www.zainostore.com/
It is like a religion.
Many competitors.
But IMO and experience, Zaino wins more car shows than any product. I myself won the concours de' elegance in Ft Pierce FL with a Miata and 5 coats of Zaino in 2000.
Zaino outlasts Carnauba wax many times over and does a decent job of resisting bird droppings. (You still need to remove the droppings as soon as possible. Bird droppings is just about pure acid.)
Zaino is a polymer, Like your "Paint".
It literally bonds to the "paint".
The big guys in the biz, like PPG and Dupont, don't even call it paint anymore. They refer to a car "coating".
It doesn't have "natural" ingredients anymore like house paint, it is all chemical now.
But it is an unwritten rule that a detail shop won't use many commercially available products. They wouldn't want you to watch them and duplicate their efforts basically for free!
So they use stuff like rejex, etc
Anyway, Zaino is the choice of the DIYers for Porsche, Vipers, Vettes, miatas, etc.
Remember a fine detailing is a LOT more than just the "paint".
Of course most offer various levels of detailing.
At the top level, if they don't remove your wheels, they ain't trying.
If you want to DIY, go to
www.gurureports.org/
and order their car wax report.
These guys tested just about all the products and give a fair unbiased report on all of them.
The report is cheap too.
If you still want a detailer, try to find out where and when the local Porsche club meets and drop by and ask them who they use.
The yellow pages is not where you find a quality detailer, tho you could use it to get the address I suppose. Then drop by to see their work.
But the odds are against you.
I would guess that 90% of the detail shops out there swirl somebody's paint every day. And 90% of them don't pull wheels or treat weatherstrips (With something other than oil products)
Homer