Powertex Stone Art Powder, 250g Powertex Stone Art Powder is a powder. It can be mixed with Powertex Universal Medium to create a light air clay. Your finished sculpture can be painted with Powertex paints, acrylics or oil paints. Powertex Stone Art Powder should be mixed in a bowl with a little Universal Medium and the 2 ingredients are kneaded to form a non-stick dough. If the dough is too soft add more Powertex Stone Art powder and if it is too hard add more Universal Medium. When your creation dries in the air (no baking required) it can be painted with pigments, acrylic or oils. If you want to create a leather look, roll out the clay with a rolling pin or a bottle and lightly brush with dye.