Walls: A painting made directly on a wall or a ceiling is termed a mural. The surface of the wall has to be carefully prepared so that the paints will have the maximum chance of adhering. For fresco-painting this implies special plastering. For oil-painting the wall will need to be thoroughly isolated and then given an adequate lead priming. For acrylics the surface should be treated with acrylic medium and water to consolidate the plaster. Large oil-paintings on canvas arc sometimes marouflaged (attached) on to walls using a variety of adhesives; the traditional one being white lead and oil, with sometimes a little dammar varnish to increase initial tackiness. Several of the modern synthetics have been used, although they may have the drawback that they are not reversible if it is necessary to move the painting.

 

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