Anything that was liquid and becomes a solid is said to be dry. You're splitting hairs over semantics.
Cure may not be the correct modern scientific term (excuuuuuse me) but enamel does not harden like lacquer or acrylic. If you leave enamel in an open can for a length of time it forms a skin as a result of a reaction to the atmosphere. That skin will gradually thicken and slow the hardening of the remaining liquid.
If it dried same as lacquer or acrylic. It would turn into a solid lump relatively fast.
Even in a layer as thin as a sprayed coat of paint this skinning occurs and therein lies the issue with applying additional coats over partially hardened enamel.
I'm not a scientist or a chemist and It's been 30 years since I painted a car so a lot may have changed, but enamel is still enamel and there may be a "recoat window" but the entire reason for painting with enamels is to apply it wet so it flows out to a smooth finish so you can get on with more important things like drinking beer and picking up chicks.
Either that or, if you lack the proper skills, put it on dry, let it harden, wetsand and polish.
It's paint, not rocket science.
