Galkyd Gel Painting Medium by Gamblin Artist's Oils
Galkyd Gel Medium is a gelled alkyd resin oil medium that holds thicker, sharper brushmarks and dries quickly (within 1-2 days). This stiff gel creates transparent impasto and can be applied in multiple layers. Galkyd Gel extends oil colors, but does not make them fluid.
More information using gel mediums:
Inspiration using Galkyd Gel Medium: