Alclad II metallic paints are laquers and, as Vric pointed out, do dry
very quickly. If you have the time be safe and let them cure for
24 hours before doing anything else to them. If you don't give
them a couple of hours at least. There is no cut-and-dried curing
time for them, just as there is none for any other paint. It
depends on many environmental factors such as temperature, humidity,
air circulation, etc.
Their primer, on the other hand, never seems to fully cure. I
used it for a while and finally gave up because I never could get it to
behave. There is probably a way, and it's probably something I
was doing wrong, but at times it would still feel tacky weeks after it
was sprayed. I even have a little test model I sprayed with it
that still felt tacky 6 MONTHS after I sprayed it.