I wouldn't worry about the future, it is not that runny when airbrushed, and tends to stay put pretty well. If you need it to dry quickly on a strangely shaped part, you can thin future 3 parts future to 1 part iso alcohol, works fine.
Only thing I hear is the windex. Windex breaks down acrylic paints, and should never be used as a thinner. I use windex to clean my airbrush, so I know how well it attacks acrylics. Thin acrylics with distilled water, airbrush medium, or just use future! Depending on the brand, most like this just fine. I start at about 3 paint to 1 future when thinning Vallejo acrylics for airbrushing, though you will get a slower drying 'wet edge' when using water.
Hope this helps!
Chris
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