Answer
For peeling concrete paint, remove loose coating, use 60 or 80 on heavy edges, then 120 to blend.
Why it happens
Peeling coating edges need removal and feathering before the next coating.
Recommended grit
Use 60 or 80 for heavy loose coating, then 120 for smoother edge blending.
Wet or dry
Dry with dust control.
Success check
The concrete is clean, dull, and free of loose coating edges.
What to do
- Remove loose peeling paint first.
- Use 60 or 80 on stubborn rough coating edges.
- Blend edges with 120.
- Clean dust before primer or coating.
Avoid: Do not coat over loose peeling paint.