These bottles can be used to hold a multitude of shop liquids. Our favorite use is to mix the desired color and consistency of paint that we like to use in our gravity feed finish airbrushes. When doing finish work a drop or two in the airbrush cup often is all that is necessary. When you are finished with that color, simply squeeze the dispenser bottle and suck back any remaining paint. And Look..... No Waste. Keep a bottle filled with thinner to flush your airbrush.