Mark,
You need to plan out the entire product line before anything and make sure it is all compatible. I'm using Nason Ful-Poxy (491-16) on bare metal. Then using Evercoat (100282) for filler, Then I plan on hitting that with another coat of Ful-Poxy because you are bound to sand back to metal while blocking. Then spray Nason 2k (421-19). Now for the base/clear I am working with a shop that has successfully used Sherwin Williams products on top of the Nason. But I might just make this guy to use the Nason brand.

Point is, try not to use a bunch of different products unless a professional has given you the green light. In my example above, the Evercoat is not Nason, its Metalworks but I bought it at the same place I got the Nason primers and they told me that it is perfectly fine.

Finally, this link below is my road map to a good paint job.
Perfect Paint Job

Good luck!
Michael