Anyone correct me if wrong.
What makes a paint durable is UV resistance. A paint with ore solids covers better than one with less.
BC/CC. The base goes on better especially if it contains metallic than single stage. Or easier to apply evenly I guess is my statement.
SPI.. Many like their products and so do I. They also have excellent tech assistance. Read their tech sheet as with any auto paint product. ie. They stress their epoxy primer requires 24 hrs above 60 degrees. Use of Ospho as metal prep can be a problem.
I have had good and durable results with Shopline and Nason. Is it better than more expensive stuff, dunno know, never used the high priced stuff!!