Jo Sonja Gel Retarder Medium, 250ml.Gel Retarder Delays Drying Time of AcrylicsUse with the Jo Sonja’s Artists’ Colours For Painting & Antiquing Medium.To Delay Drying Time, Does not Reduce Paint Viscosity.Approximate Coverage: 1 oz = 3 square feet 1 ml e = 94 square cm. Gel Retarder extends...