1 The adjacent plaster is first thoroughly wet with a sponge. That causes, that moisture is not removed too quickly from the plaster or filler, which can lead to poor adhesion and cracking. Particularly important, if the plaster has been removed with a chisel and has flaked off irregularly.
2 The filler is spread onto a smoothing trowel using a spatula. The mass should have a slightly stiffer consistency, so that it sticks well to the trowel.
3 Now the filler is pressed into the cable slot in sections and then roughly removed. To do this, place the trowel on the adjacent plaster with little pressure and pull in the direction of the slot.
4 Once the entire slot is filled, take the long side of the smoothing trowel and smooth the surface. The more open (steeper) the trowel is held, the more material it takes.