Answer
For metal railings, use 120 or 180 on rust and loose paint, then 220 or 320 before primer.
Why it happens
Railings need rust removal, edge blending, and scuff sanding before primer or paint.
Recommended grit
Use 120 or 180 on rust and loose paint, then 220 or 320 for paint prep.
Wet or dry
Dry.
Success check
The railing is clean, dull, and free of loose coating.
What to do
- Remove loose paint and rust first.
- Sand rust or rough edges with 120 or 180.
- Refine with 220 or 320.
- Clean dust before primer or paint.
Avoid: Do not paint over rust or glossy old paint.