'22 Studebaker Paint

[Kfigel]

Spent the winter bringing back the original paint on my '22 Studebaker.  Had a lot of success in bringing all the body parts (fenders, hood, outside cowl cover, windshield frame, etc.) EXCEPT for the body proper to a nice gloss finish (see front hood photo).  The body itself is not "responding" and is still is dull and faded (see photo of just in front of the windshield).  I used all Meguiar's cleaning and polishing products.  Any thoughts on what the difference might be?  Would the bodies themselves have been originally painted with a different paint system?