Advance-Design trucks' exterior paint was Dupont Dulux alkyd resin enamel. The interior paint might of been Dulux or it might have been Duco nitrocellulose lacquer.
Neither paint line is still available from Dupont.
Good substitute paint would be acrylic enamels, 2-part single stage urethane enamels, or 2-part/2-stage clear-coat/base-coat enamels.
PPG Delstar acrylic enamel is very good.
PPG Concept (DCC) acrylic urethane enamel is an excellent 2-part, single stage paint that can be polished to a beautiful finish.
