Another possible item to be aware of is that Dullcoat is lacquer based and naturally has fairly aggressive solvents. It's not a real big problem, but you do want to watch even a bit more than normal that you don't put on too heavy a coat lest it attack the underlying paint.
Like J-Hulk, I have had some issues over the years getting a dead flat finish out of it. Some bottles would be good and others would leave a bit of a sheen. Since my LHS doesn't carry either Gunze's or Pollyscale's clear, I switched to mixing Future with Tamiya's Flat Base at a ratio of 4 parts Future to 1 part Flat Base, and have gotten excellent results. One nice thing about Future/Flat Base is that Future is so cheap as to be effectively free which makes the overall cost decently inexpensive.
Andy