Make up the gap
Scrape the width of the gap with a putty knife and scrape it into a figure of eight with a wide outside and a narrow inside.
stop a gap
Fill the gap with gypsum block dry powder to 30-40mm or deeper. You don't need to fill the wall, it needs to be lower than the wall1-1.5 mm.
Brush paint
Adjust the wall coating. Brush the sample first after coating adjustment. Compared with the wall color after drying, the color is close and the color difference is not big. Then paint the wall.
Brush 108 glue
Brush the gap with 108 glue and stick glass cloth or kraft paper strips.
Joint with putty
Scrape 82 1 putty for 2-3 times and smooth it with the original wall. After drying, polish it with sandpaper.
Covering paint
If there are only fine lines and cracks on the wall, it can be covered with paint; If there is a big crack, it needs to be covered with putty first, and then with paint; If the crack is big and deep, it is necessary to shovel off the original putty and re-fill the crack with elastic putty.