Check for the "low-oder" type Piant thinner/ Mineral spirits. I've used this type for years with great performance from the airbrush. I've done alot of experimenting with various thinners for both acrylic and enamels, and there seems to be a slight difference in the way pain mineral spirits blends testors enamels an the low-oder type, labeled "Paint thinner for oil-based paints. Check for the two when you go shopping. The best alternate thinner I've used by far, for my MM enamels is a lesser known product called T.R.P.S. (turpentine replacement paint solvent). It thoroughly blends the paints' vehicle and solvent and does a better job of suspending the pigments while you airbrush. It has a modest oder, works as an airbrush cleaner as well. Just another option for ya. Hope this is useful.
Look for T.R.P.S. at your local home stores, Menards, etc..
Greg Williams
Owner/ Manager
Modern Hobbies LLC
Indianapolis, IN.
IPMS #44084