Answer
For painted brick fireplace prep, clean first, use 120 on rough paint edges, then 180 for smoother blending.
Why it happens
Old paint and soot residue need cleaning and edge blending before repainting.
Recommended grit
Use 120 for rough paint edges, then 180 for smoother blending.
Wet or dry
Dry with dust control.
Success check
The brick surface is clean and loose edges are blended.
What to do
- Clean soot and dust first.
- Remove loose paint.
- Feather rough paint edges with 120.
- Refine with 180 before primer or masonry paint.
Avoid: Do not paint over soot, dust, or loose paint.