I have been spraying PPG products for over 25 years. I agree with some of what Deve has said above. However... The Concept paint is a single stage paint. Meaning that it does not need a clear coat.
Different painters like different products. Ask the guy who is holding the gun what he prefers. Getting something that he is used to will assure that he knows how things will lay down and your paint job will be better.
I just painted my 46 2-ton. I used this process..
-Bare metal
-Rust repair/metal work
-DP Epoxy primer
-All body work
-Evercoat Slick Sand ( cheaper than K38. A sprayable body filler almost)
-Block with 80 touch up body work
-PPG K38 Block with 220 dry fill minor imperfections
-PPG K38 Block with 320 wet
-Wet sand with 500
-DP Epoxy reduced with DT870
-PPG DBC base coat
-PPG 2002 clear with DFX11 hardner and reduced with DT 885
See the photo's in the link below.