Liquitex Slow-Dri Retarder Gel
Extend your working time with Slow-Dri Blending & Painting Medium, which provides superior surface blending with acrylic paint. Any amount of medium can be mixed with acrylic colour to increase viscosity, gloss and transparency. Increase working time and slows drying time by up to 40%. Dries clear and non-yellowing. Flexible and water-resistant when dry.