Liquitex Professional Acrylic Medium - Slow-Dri Gel Additive - 237mlLiquitex Professional Acrylic Medium Slow Dri Gel Additive 237ml Thicker Retarder Gel for Enhanced Acrylic BlendingLiquitex Slow Dri Gel Additive is a thick, gel based retarder designed to extend the open time of acrylic paints, especially Heavy Body colors. It provides more time for color blending and manipulation without affecting paint structure, making it ideal for low humidity environments and techniques that require longer working time.