1) Identify the problem
Your repair procedure isn’t going to be effective without knowing the root cause of the problem. The exterior walls could get flaky due to various reasons, such as moisture accumulation, painting in adverse weather conditions, adhesion failure caused by poor-quality products or normal wear and tear.
2) Scrap off loose paint
Using a scraper, remove the paint. Take a wire brush and sweep away the remaining dust. Use a fine-grit sandpaper for smoothness.
3) Use a pre-paint cleaner
These special cleaning solutions promote good adhesion between the substrate and the paint. It also kills mould spores thereby preventing future mould growth.
4) Use a good-quality filler
Apply it as per the directions by the manufacturer to repair cracks and holes. Let it dry and use a sandpaper.