Answer
For window frames, use 120 or 180 on peeling areas, then 220 for final prep.
Why it happens
Old paint, weathered areas, and glossy spots need different prep before primer or paint.
Recommended grit
Use 120 or 180 on peeling areas, then 220 for final paint prep.
Wet or dry
Dry.
Success check
The frame feels smooth and the paint edges are feathered before coating.
What to do
- Remove loose paint first.
- Use 120 or 180 on rough peeling edges.
- Blend and smooth with 220.
- Clean dust before primer or paint.
Avoid: Do not leave hard paint ridges around peeling areas.