marouflage

from The Century Dictionary.

• noun The process or the act of applying a mural painting to a wall by coating the back of the canvas with a strongly adhesive paste and applying it. This device allows mural paintings to be in oil colors, and also allows the work to be done at a distance from the building for which it is intended.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A technique for affixing a painted canvas to a wall to be used as a mural, using an adhesive that hardens as it dries such as plaster or cement.