Actually Stymye's recommendation would be good for beginner to intermediate airbrush users who don't wanrt to fuss over thinners that may or may not work.
I have always used a thinner that is compatible but not overpriced like the manufacturer's thinners and have always had great results. Then again, I have been airbrushing for about 20 years so my results may differ from the next guy as we all like to use what works for us.
Back to the original post, try the clear straight from the bottle and let us know how it works.