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Anyone have experienced using Vallejo airbrush thinner to thin gw palette paint and washes instead of distilled water? Is it a better alternative?

The paint is just gonna dry quicker. So I'd say no.

Actually, I had the opposite result--dried stupid slow, thinned nicely. I expect slo-dri medium might be a better choice, and I'm a very iffy painter and I used a lot of thinner vs. paint, but worked ok when I tired it.

I tried it and don't really like how it behaves. A better alternative is Vallejo airbrush flow improver with abbot of drying retarder if you need to slow it down, or a bit of glaze medium mixed with water.