Liquitex-Slow Dri Blending Gel Medium. A heavy body gel used to extend the open time of acrylics by more than 40% for easier blending. Add up to 50% without jeopardizing the strength of the paint film to achieve excellent impasto techniques. This package contains one 8 ounce bottle of Slow-Dri blending gel. Conforms to ASTM D4236. Imported.