i have done this several times i use decopage i paint it on the walls then applie the material to the wall by soaking your fabric it would cause streaching and bunching and when the materil dries it some times shrinks as i put the material on the wall i use tacks to hold it inplace one i have all the material adheared i start painting it with decopage untill i get the look i want i than open the window and spay a sealer which keeps the decopage from getting sticky in the warm sun. the decopage and sealer makes the fabric washable with a damp spong elmers glu does work as a decopage you can get the decopage in a gloss or satin finish you will also wannt to get you spray sealer in the same typ surface