I use this Tamiya XF-20, Medium Gray acrylic paint as a base coat in combination with Tamiya XF-73 Dark Green to provide upper surface camouflage for my British WWII aircraft. It's easy to apply and gives me the finish I want.

Tamiya paint is awesome. It can be thinned with x20a, h20, laquer thinner, or alcohol. I use tamiya laquer thinner most of the time because it gives the paint a harder shell to be able to hold up better to the weathering processes I use. I like to use this paint in combo with tamiyas german grey on panzers to create color mod or faded panels.

Paint to Thinner range 2:1 to 1:1 for airbrushing depending on air pressure, paint volume and distance from subject. Experiment on scrap plastic first.