what grit sandpaper to scuff paint to repaint

For most repainting jobs, scuff the existing paint with fine sandpaper in the 180–320 grit range so the new paint can grab without gouging the surface.

Quick scoop: ideal grit range

• A safe “one-size” choice for many projects is around 220 grit for scuff‑sanding paint before repainting.

• The goal is not to remove all the paint, but to dull the sheen and give it light scratches for better adhesion.

By surface type

• Interior walls/ceilings: 120–150 grit if the old paint is glossy or has minor imperfections; finish or lightly go over with 180–220 if you want a smoother feel.

• Furniture/wood trim: 180–220 grit to scuff existing paint or clear coat without cutting through too aggressively.

• Metal (doors, railings, etc.): Start with 120 grit only if you need to knock down rust or peeling paint, then move to about 220 grit for the final scuff before new paint.

• Automotive paint: Often scuffed with 320–400 grit (sometimes even finer wet grits) to bite into the glossy finish without visible scratches under the new coats.

• Plastics: Use gentler grits like 320–600 to avoid deep scratches while still dulling the surface.

Simple step-by-step

1. Clean the surface well (degreaser or mild cleaner), then let it dry completely.

2. Use your chosen grit (typically 180–220) with light to moderate pressure, just enough to remove the shine.

3. Wipe off dust with a tack cloth or damp rag and let dry.
4. Apply primer if needed (especially over glossy, bare, or patched areas), then repaint as directed.

Quick rules of thumb

• If the paint is in good shape but glossy → 180–220 grit.
• If the paint is rough, chipped, or peeling → start coarser (80–120) only where needed, then finish with 150–220 before paint.

• For very smooth, high‑end finishes (cars, cabinets) → 320–400 grit, often wet‑sanded, to balance grip and smoothness.

Bottom line: For “what grit sandpaper to scuff paint to repaint,” most DIYers can grab 220 grit and be in the right zone for typical walls, trim, and furniture.

Information gathered from public forums or data available on the internet and portrayed here.