Me........ I would let the paint dry out for a couple of days... maybe a week before I would use the future first. (Remember that we are using enamel paint, so I do want it to dry).Now the question: Model Master Flat was mentioned; is that the "Flat Clear Lacquer"? Is it OK to use this over Future? Someone earlier in the thread said that it was OK to use Testors Clear Lacquers over future, but now I'm not sure.
Then if you really want to go over this with lacquers.... then the let future dry for at least a week. When ready to apply the lacquers... I would first lightly mist it on and let it dry for about an hour or so. Then, mist each layer on.... giving it some time to dry before the next coat.
Me... I am cautions... so, YES, I do take the time to let everything dry before I move forward.
But, hey, that is me.