Fine cracks:

Wet the wall with a roller brush.

2. Remove the existing wall plaster.

3. Durable cotton duck or specially coated base cloth available on the market.

4. After applying, smooth out the putty.

5. Sand the roller latex paint once it has dried.

Large cracks:

1. Check if the plaster layer on the wall has loosened; if so, knock it off and re-plaster until it's firm. 2. If the wall is made of gypsum board, apply paper tape to the joints.

3. If the wall crack is only a few millimeters wide and looks unsightly without repair, you can scrape off the putty, and then fill the gap with cement or plaster (mixed with some glue).

4. After the issue was resolved, applied bandages, applied joint compound, and rolled on latex paint.

Three, Peeling: If there are localized bulges or minor cracking and flaking on white walls or bare walls, you can scrape away the affected areas. After smoothing the edges, re-skim the surface, apply a primer, and then repaint. This will promptly repair the issue, though there may be a slight color difference from the original wall. Do not rush to repair cracks and peeling; first, determine the cause, then proceed with the treatment.