How to Sand a Wooden Staircase for Refinishing: Safe, Smooth, and Durable Results (60–220 Grit Guide)

Sanding a wooden staircase before refinishing ensures the new finish adheres properly and looks beautiful for years. This process smooths worn treads, removes old finish, and prepares the wood for stain or paint while preserving the structure’s integrity.

Why Sand a Staircase Before Refinishing?

Over time, stairs accumulate scuffs, dents, and worn spots. Sanding removes these imperfections, evens out the surface, and opens the grain for better absorption of finishes.

Tools & Materials

• Detail sander or sanding block
• Vacuum and tack cloth
• Drop cloths to protect surrounding areas
• Wet/dry sandpaper sheets
• Dust mask, safety glasses, and knee pads

Recommended Grit Sequence

• 60 grit: Removing old finish and leveling rough areas.
• 120 grit: Refining after coarse sanding.
• 220 grit: Final smoothness before staining or painting.

Step-by-Step: Sanding a Staircase

1. Prepare the workspace. Cover nearby floors and railings to keep dust contained.
2. Coarse sanding. Use 60 grit (50-pack) to strip old finish and smooth out dents or scratches.
3. Smooth the surface. Switch to 120 grit (25-pack) for refining and preparing for final sanding.
4. Final prep. Sand with 220 grit (100-pack) to achieve a smooth, even surface ready for finishing.
5. Clean up. Vacuum and wipe with a tack cloth to remove all dust.
6. Apply finish. Stain, seal, or paint the staircase following product directions.

Special Cases

For intricate stair spindles, hand sand with folded sheets to avoid rounding over edges.

Pro Tips

• Work slowly on edges to maintain clean lines.
• Always sand with the grain to prevent scratches.
• Replace sandpaper when it stops cutting efficiently.

Aftercare

• Allow finish to cure fully before using the staircase.
• Use protective pads on shoes during the curing period to avoid scuffing.

FAQs

• Can I use a belt sander on stairs? It’s possible, but a detail sander offers more control in tight spaces.
• Do I need to sand between finish coats? Yes—lightly with 220 grit for optimal adhesion.

Watch & Learn

For safe and smooth refinishing results, stock up on the right grits. Shop all wet/dry sandpaper sheets today.