Huh, I normally used hardware store lacquer thinner for MM paints for years, but since I got a new can, it can’t even clean the airbrush properly. Must be all that VOC regulations that keep making paint suck more and more.
I then switched to Gunze’s Mr. Leveling Thinner and Mr. Replenishing Something-Or-Another, and used them on MM enamels with no problems. BUT!!! I did notice the Testors Airbrush Thinner emulsified the pigment in certain MM enamels a little better. But MM enamels keeps getting worse, and now I find airbrushing flat black takes many coats for 100% opacity. I tried Gunze’s flat black, and bang, two thin coats made for complete coverage.
We have one source for Gunze Mr. Color, and they are going out of business before the end of the year.