Chalky Transfer Medium, 230 ml jar of medium. Clear varnish is used to transfer prints on paper to various surfaces, such as wood, canvas, paper mache, glass, etc. The surface must be dry, clear, clean, free of grease and dust. Generously apply the medium with a brush to the surface. Immediately place the paper print (with the design facing down) on the chosen surface and smooth it out. Remove excess medium with a clean cloth. Let it dry for about 8 hours. Next, moisten the print and carefully rub the paper layer with a soft, damp sponge. The design will now adhere to the surface.