Baked Scale Coat works the best for decals.
Technically enamel doesn't dry, it cures.
This is from a website & talks to enamel
On One Hand: Enamel paint oxidizes. Many people use enamel paint for the glossy and radiant finish that it can provide. The paint usually air dries to a hard finish and can be used to decorate a variety of things, including glass and wood. Technically, enamel paint doesn't dry, but cures. Curing is a process in which the paint becomes hard by oxidizing.On the Other: Some factors affect drying time. Humidity and temperature can affect the amount of time that it takes enamel paint to dry. When the paint attempts to dry in a cool and humid environment, drying times could be longer than if the environment is hot and dry. Individuals should also consider the amount of enamel paint they apply to a surface. The thicker the coat of paint, the longer the drying time will be. The rate of drying time also depends on the type of enamel that is applied. Bottom line according to Haymes Paint, full-gloss oil-based enamel has a drying time of four to six hours. However, if a second coat is applied, the
