I needed a shade of blue I didn't have so I decanted some Tamiya acrylic blue and black spray paint. I added black to the blue until I had the shade of midnight blue I wanted. The paint in the mixing cup was starting to skin over so I added some Tamiya acrylic thinner from a bottle. It didn't mix well but I airbrushed it anyway. It didn't go on as smooth as I wanted but it was OK for what I needed. I then poured out the little remaining paint I had in the airbrush, poured in some thinner swirled it around and sprayed the airbrush dry. The paint was still on the inside of the airbrush cup so I added some lacquer thinner, swirled it around and sprayed the airbrush dry and the paint was still on there. I got a Q-tip with lacquer thinner and scrubbed out the paint. It came out easily when rubbed. I then used commercial windex in the ultrasonic cleaner and cycled the airbrush through twice.
Is the Tamiya acrylic spray paint different enough from the bottled acrylics to cause these issues?