Surfaces for Casein
recommended using a stretched canvas as a support for painting in
casein. I always thought casein had to be painted on a rigid surface.
Which is true?
Both recommendations are true; but it is also true that rigid
panels, museum boards, heavy papers, and thin papers and fabrics
mounted on board are more typically used with casein. Because canvas
has a fair amount of flexibility, and because casein is one of the most
brittle of all media, only thin applications of casein dissolved with
water should be used on canvas. Otherwise all the supports used with
other water-based media are appropriate for use with casein painting.
Casein is a relatively versatile medium and can be applied with
moderate impasto or with a smoother, thinner technique. If used too
thickly, the casein surface will crack. This is especially true if the
top layers have more glue content than the lower layers. Also keep in
mind that although you can thin the layers of casein paint with a
generous amount of water it may also cause the fresh paint underneath
to dissolve. By adding a drop of acrylic matte medium to the water you
can avoid this effect.