Technically, acrylic paint can be used to paint directly on a wall. However, due to the absorption of, for example, stone, plaster and stucco, a good preparation will give a better result because, with the paint, the intensity of the colour will also be absorbed, as it were, by the wall. If the colour of the wall is to be part of the artwork, suction can be reduced with Amsterdam Acrylic Binder 005 (Acrylic Binder is a pure unpigmented acrylic dispersion that dries colourless and transparent). If a white surface is desired, the wall can be prepared as follows: brush with thinned Amsterdam Acrylic Binder ± 20% water is sufficient dilution, for strongly absorbent surfaces apply pure. Apply two layers of pure Amsterdam Gesso, let dry for 24 hours in between.