Liquitex-Slow Dri Blending Medium. An essential medium for creating softer edges and modeled forms. This medium is used to extend the open time of acrylics by more than 40%, giving you an opportunity to really work the paint to enhance color blending. You can add up to 50% of this medium, as it contains binder to retain the integrity of the paint film, unlike the additives version. This package contains 4oz/118mL of Slow-Dri Blending Medium. Conforms to ASTM D4236. Imported.