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Problem

What grit to sand walls before repainting?

Repainted walls can show bumps, glossy spots, or poor adhesion when the surface is not prepped.

drywall patch paint primer dry sanding
Answer

For walls before repainting, use 180 or 220 on patched areas and 220 or 320 for light scuff sanding.

Why it happens
Old paint, small ridges, and patch edges need light scuffing so the new paint lays evenly.
Recommended grit
Use 180 or 220 for patched areas and 220 or 320 for light scuff sanding on painted walls.
Wet or dry
Dry.
Success check
The wall feels smooth, clean, and evenly dull before repainting.

What to do

  1. Clean the wall surface first.
  2. Sand patched or rough areas with 180 or 220.
  3. Scuff glossy painted areas with 220 or 320.
  4. Remove dust before primer or paint.
Avoid: Do not paint over glossy spots, dust, or raised patch edges.

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