Amazon.com: U.S. Art Supply 4-Ounce Pint Airbrush Thinner for Reducing Airbrush Paint for All Acrylic Paints - Extender Base, Reducer to Thin Colors Improve Flow - Works for Thinning Acrylic Pouring Paint :
Createx High Performance Reducer - 32 oz | Michaels
Thins Water-Based Paint Paint Thinners at Lowes.com