Daler rowney system 3 screen printing medium daler rowney 127500011 the daler rowney system 3 screen printing medium 5 litre enables you to use your screen printing equipment again and again the medium slows down the drying of acrylic colour on the screen and reduces the risk of screen blocking making it easier to wash out with soap and water the medium can be thinned with water system 3 acrylic colours retain density of colour even after mixing with medium and substantial covering power