1. Keep the walls clean and dry.
2. Put tape on the crack and press it tightly.
3. Make sure that the gap is covered by tape, then use a knife to cut off the excess tape, and finally apply the mortar.
4. Let it air dry, and then lightly sand it with a construction hammer.
5. Fill enough paint to make the wall surface smooth.
6. Cut off the leaking tape. Then, notice that all the cracks have been properly repaired, and use fine composite materials to modify the surrounding areas of the joints to make them look as clean as new.
