Small cracks:

Wet the wall with a roller brush.

2. Remove the existing wall plaster.

3. Use cotton duck or a specific base cloth commonly used in the market.

4. After applying, smooth the putty flat.

5. Sand the roller latex paint once it's dry.

Large cracks:

1. Check if the plaster layer on the wall is loose; if it is, smash it off and re-plaster until it's solid. 2. If the wall is made of gypsum board, apply paper tape at the seams.

3. If the wall joints are only a few millimeters out, it can be patched without looking bad by scraping off the putty, and then filling the gap with cement or plaster (mixed with some glue).

4. After it was sorted out, applied bandages, smoothed putty, and rolled on latex paint.

Three: Peeling: If there are local bulges or slight cracks and flaking on white walls or bare walls, you can scrape off the affected areas, smooth the edges after removal, apply a new layer of putty, followed by primer, and then repaint or recoat. This will allow for timely repairs, but there may be a slight color difference compared to the original wall. Do not rush to repair cracks and peeling; first, identify the cause, and then proceed with the treatment.