Abstract: A plastering trowel for spreading plaster on a wall has a substantially rectangular sheet of material and a handle attached to the rear surface. The sheet is made from flexible material and has a curvature such that the front spreading surface is concave along its length. When the plastering trowel is positioned with the front spreading surface adjacent to the wall and the handle is manually urged towards the wall, the sheet flexes such that the front spreading surface becomes approximately planar. Preferably, the long edges of the sheet are rounded away from the front spreading surface. The sheet also preferably has rounded corners and slightly curved short edges.