A lot of people think that when airbrushing, there is actually a true ratio of paint to thinner. This is not correct. You thin paint to the consistency that you want. Anyway, this thinner is useful because it can also thin paints along the Model Master acrylic paint line. Tamiya acrylics are easy to handle and use, so if you are using these paints, this product is essential.

Don't get me wrong this product works great and can be used with almost every acrylic. However it is way too expensive for what it is. A 2 to 1 ration water to isopropyl alcohol with a mil of acrylic retarder and (optionally) a mil of flow improver per 60oz batch works exactly the same. A lot of the time more retarder has to be added even when using this product anyway so something good to have on hand. I use Windsor and Newton but Hobbylinc usually has Vallejo as well which is essentially the same thing and works well. Pick your favorite flow improver I use Liquitex because I randomly found it in a shop, but any brand will work. 1 bottle each of flow improver and acrylic retarder will last what seems like forever making its unit cost excellent.

This was literally formulated by chemists to work well with Tamiya acrylics and it does. It's not pricey at all considering how much thinned paint is actually used when airbrushing. Having around 3-4 bottles of this stuff should let you thin the entire range of Tamiya gloss acrylics and a good amount of the flat colors, too. It sprays perfectly smooth with a 1:1 ratio in my Iwata Revolution CR. I use 12 psi.