Golden Artist Colors Additives 4 fl. oz Acrylic Paint Retarder | JOANN
▷ Airbrush Retarder - Flow improver| - GSW
Amazon.com: U.S. Art Supply Acrylic Retarder Acrylic Medium, 200ml Tube (6.7 Ounces) - Mixed with Color gives you longer Working Times : Arts, Crafts & Sewing
MM1 | How to Extend Your Acrylic Paint Drying Time - Matisse Retarder Medium - YouTube