Drew is right.
Keep the airbrush farther away and spray some "dust coats" of dullcoat on it.
After that dries you can spray a little heavier as the dullcoat you dusted on will protect the enamel.
With the high-quality acrylic flats out there I see no reason to use Dullcoat lacquer anymore personally.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon