Recent post from a general "Painting" thread:
Lately, I have had trouble finding Testor's DullCote. I bought Tamiya Flat Clear (also a lacquer), and was very happy with the result. I have used in aerosol form (convenient).
I also have used Tamiya Acrylic Flat Clear acrylic through my airbrushes with good results. For re-glazing plastic "glass" after I dull the entire car or loco, I use Testor's Gloss Cote, brushed, right out of the bottle.