Add a small amount of our retarder to your acrylic paints and you'll nearly double the open/drying time. We recommend mixing no more than 5% retarder into your paint; often just a drop or two will do the job. ...
Winsor & Newton Acrylic Retarder is a translucent gel which extends the drying time of acrylic colours. At the same time it does not alter their consistency or ...