Galkyd Painting Medium #1 is an alkyd resin medium that increases the fluidity of oil colors and speeds their drying time. Thin layers of oil colors are dry in 24 hours. Using Galkyd will level brush strokes, create a strong flexible paint film and leave an enamel-like glossy finish. Ready to use, Galkyd can be thinned with odorless mineral spirits. Galkyds make excellent glazing mediums.