Strip Old Finish from Tread Surfaces

What happens in this clip

Begin the sanding process by using a random orbital sander (e.g., Festool ETS 125 REQ) equipped with 80-grit sandpaper. This initial coarse grit is essential for effectively stripping away the worn-out polyurethane and any underlying stains or imperfections down to the bare wood. Apply even pressure and move the sander systematically across the main flat surface of each stair tread. Pay attention to dust collection; if your sander has a dust extraction port, connect it to a shop vacuum to minimize airborne dust. Work carefully to avoid oversanding any single spot, especially if dealing with a veneered tread.

Goal: Strip the bulk of the old finish from the main surface of the stair treads using a random orbital sander, starting with a coarse grit sandpaper.

What's used

Tools

• 80-grit Sandpaper
• Dust Mask/Respirator
• Hearing Protection
• Random Orbital Sander
• Safety Glasses
• Shop Vacuum (with hose and dust port attachment)

About the full video

This project provides step-by-step instructions on how to refinish worn-out stair treads, focusing on effective sanding techniques in tight spaces and proper polyurethane application for durability. It covers preparing the treads, removing old finishes, dealing with corners and edges, and applying multiple protective coats.

Step 4 of 8: Prepare Tread Surfaces

After cutting, thoroughly sand each new tread. Start with a coarser grit sandpaper (e.g., 80-100 grit) to remove any saw marks or rough edges, then progress to a finer grit (e.g., 150-220 grit) for a smooth finish. Vacuum or wipe down each tread to remove all dust. This preparation is crucial for proper adhesion of any finishes and for a clean appearance.

Open this step in the guide

Every video in How to Install Treads on Stairs with a Mid-Stair Landing

1. Step 1: Assess Existing Stair Treads

   • 0:00–0:13 Assess Existing Stairs and Planning
   • 0:01–0:04 Remove Stair Covering
   • 0:00–0:56 Assess and Remove Old Stair Treads

2. Step 2: Measure and Template Treads

   • 0:55–1:13 Measure and Mark Tread and Nosing
   • 0:57–1:16 Measure Treads and Mark Laminate
   • 0:29–0:45 Mark and Cut New Stair Treads

3. Step 3: Cut New Stair Treads

   • 1:16–2:13 Measure and Cut New Stair Treads
   • 4:34–5:55 Measure and Cut Treads
   • 2:07–2:42 Mark and Cut Your Treads

4. Step 4: Prepare Tread Surfaces

   • 0:51–0:57 Strip Old Finish from Tread Surfaces (this video)
   • 2:06–2:59 Sand Solid Oak Treads
   • 0:33–0:39 Cut & Sand New Treads

5. Step 5: Test Fit New Treads

   • 2:13–2:35 Test Fit and Adjust Treads
   • 1:35–1:41 Dry Fit Tread and Nosing
   • 19:07–19:52 Dry-Fit and Test Treads

6. Step 6: Apply Adhesive and Fasten Treads

   • 2:32–3:28 Install First Tread and Riser
   • 1:24–1:35 Apply Adhesive and Install Treads
   • 9:53 Install New Treads

7. Step 7: Install Risers (if applicable)

   • 1:24–2:00 Install Risers
   • 0:04–0:08 Measure, Cut, and Install New Risers
   • 3:28–6:52 Install Remaining Treads and Risers

8. Step 8: Fill Screw Holes and Finish

   • 4:25–4:47 Fill Gaps and Nail Holes
   • 5:31–6:06 Apply Finish & Clean Up
   • 1:28–1:50 Clean Up and Finish