ATOM paint Thinner and Cleaner with Retarder 500mlATOM paint Thinner and Cleaner with Retarder 500ml Thinner is specially formulated for acrylic paints, and it includes a retarder to slow down the drying time. Designed for ATOM paints from AMMO by Mig Jiminez, but can be used with other similar water based 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