Weber Res-N-Gel Quick Drying Extender Gel
For Oil Painting: This synthetic resin gel produces transparent, yet full-bodied colors. It extends expensive oil colors, prevents colors from running, retains the character of brush strokes, holds sharply defined detail, adds luminosity and brilliance to colors, and accelerates drying. Also expect a buttery brush response. Non-yellowing, non- toxic. It's excellent for brush or knife to create a full range of impasto, opaque, or translucent glazed effects.
“What I love the most about it is that there is no smell, it can be used with oils or alkyds and it doesn’t make my paint way too thin like many products that speed the drying time do. My paintings are dry enough to paint another layer on the very next day.”