If I remember right, CRONAR was the single stage version of Dupont's paint line,.. and Cromabase was the base coat/clear coat version. This was after Lucite (lacquer), Dulux (synthetic enamel), Centari (acrylic enamel), and Imron (polyurethane enamel).
Yes Cronar wasn't a great success...lol. It was Duponts entry into the urethane enamel single stage arena.