Abstract: Scaffold erected adjacent to a wall, which enables an easy plastering, drying cleaning, coloring, etc. operation of the wall by automatic means. Said scaffold comprises: a. a platform being erected adjacent and parallel to the wall; b. column members carrying the platform and being connected to the wall, said columns being provided with electrically actuating means enabling the ascending and descending of the platform: c. a movable apparatus (or “cat”) being attached to the platform, preferably located thereunder, which cat is able to move along the length of the platform and is provided with automatic means for actuating the plastering operation and realizing obstacles: d. automatic means for actuating the movable parts of the scaffold; and e. a storage container being suitably connected to the means performing the plastering operation.