Answer
For concrete patch before painting, level with 80 or 120, then refine with 180.
Why it happens
Patch material needs leveling and dust removal before coating.
Recommended grit
Use 80 or 120 for rough patch leveling, then 180 for smoother paint prep.
Wet or dry
Dry with dust control.
Success check
The patch blends into the surrounding concrete and is dust-free.
What to do
- Let the patch cure as directed.
- Level rough ridges with 80 or 120.
- Refine with 180 before coating.
- Remove dust completely before primer or paint.
Avoid: Do not paint over loose patch dust.