ATOM Thinner and Cleaner 400mLATOM paint Thinner and Cleaner 400mL ATOM20520 Thinner specially formulated for acrylic paints. Use this thinner to get the best results with the airbrush and to prevent clogging. It can also be used for brush painting. Ammo recommends adding 30 % thinner for airbrushed base coats. You can increase this thinner ratio as much as necessary to apply transparent coats, glazes, shading or other effects. Presented in an innovative clear 400 ml container