Answer
For brick before painting, clean first. Use 80 or 120 only on rough old-paint edges, then remove dust.
Why it happens
Brick is porous and textured; cleaning and removing loose material usually matters more than sanding.
Recommended grit
Use 80 or 120 only on small rough paint edges or loose old coating, then clean thoroughly.
Wet or dry
Dry with dust control.
Success check
The brick is clean, stable, and free of loose paint before coating.
What to do
- Clean loose dust and dirt first.
- Remove loose old paint or coating.
- Use 80 or 120 only on rough paint edges.
- Brush and clean dust before primer or masonry paint.
Avoid: Do not grind the brick face smooth unless the repair specifically requires it.