I've used Dull Coat, and the only problems that I ever had was that there seemed to be batch to batch variations in the flatness of it. Sometimes it was really flat, other times satin almost bordering on semigloss. Although it is a lacquer, as long as you airbrush a reasonable coat, it won't atack the finish.
That said, I have converted to mixing Future with Tamiya X-21 Flat base at the ration of 4 parts Future to 1 part Flat Base. It gives consistently good results, and because Futur is so cheap as to be effectively free, this makes for an extremely economical finish.
Andy