Jo Sonja's Retarder Medium 250ml Size:250ml Schmincke Aqua Primer provides an

Schmincke Aqua Primer provides an even surface for watercolour painting

Spray apply using the Atelier Fine Mist Water Sprayer

Galkyd is our fastest-drying painting medium

Mixable with Acrylic and Gouache paints

non-scratchable cover

Jo Sonja's Retarder Medium 250ml Size:250ml Schmincke Aqua Primer provides anAll Jo Sonja Mediums Jo Sonja Iridescent 60ml Jo Sonja Acrylic 75ml Jo Sonja Acrylic 250ml Jo Sonja Acrylic 1Liter Jo Sonja Acrylic Sets Jo Sonja's Retarder Medium is an additive used to extend the "open" or drying time of Jo Sonja's Colours and Mediums. Acrylic paints dry rapidly in conditions of low humidity and or high temperature. Both air conditioning and winter heating reduce the levels of humidity in a room causing acrylic paints to dry faster.