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TESTORS-Aztek Airbrush Acrylic Thinner. Use this product to thin down your higher viscosity paints! The ratio is typically 4 parts paint to 1 part thinner. Use this thinner with Aztek, Testors, Model Master, Pactra, and Floquil Pollyscale Acrylics. This package contains one 4oz bottle of thinner. Imported.