well it did seem the only possible motivation, so I just wondered

my take is that the referenced [original] Dupont Baking Enamel was so named to indicate it had additives [a reducer it seems] that allowed heating, which "standard" enamels of the day didn't respond well to .... as Jenny found, all modern paints are formulated to respond to thermal fast dry techniques, aside from the seperate available 'dryers' for most paints
Bill