How to Sand and Refinish Wooden Doors for a Smooth, Durable Finish (60–320 Grit Sequence)

Wooden doors, whether interior or exterior, can lose their appeal over time due to scratches, dents, and fading finishes. Sanding and refinishing them not only restores their look but also protects them from wear and environmental damage. In this guide, we’ll cover every step—from aggressive material removal with Grit 60 to a refined surface with Grit 320.

Why Sanding Matters for Wooden Door Restoration

Doors endure constant use, exposure to sunlight, and, in the case of exterior doors, changing weather conditions. Sanding removes old finishes, smooths imperfections, and preps the surface for a new coat of stain, paint, or sealant that will last for years.

Tools & Materials

• Orbital sander for large flat areas
• Sanding block for detailed edges and panels
• Vacuum and tack cloth
• Multiple grits of sandpaper
• Wood stain or paint
• Clear protective finish
• Protective gear: mask, goggles, gloves

Best Grit Sequence for Door Refinishing

• Grit 60 — Removing old finish and leveling worn areas
• Grit 150 — Refining surface after coarse sanding
• Grit 220 — Pre-finish smoothing
• Grit 320 — Final pass for a smooth touch

Step-by-Step Process

1. Preparation. Remove the door from its hinges, take off hardware, and lay it flat on a sturdy surface.
2. Initial sanding. Start with Grit 60 (10-pack) to strip away old finish and smooth out deep scratches or dents.
3. Surface refinement. Switch to Grit 150 (25-pack) to erase coarse sanding marks and level the surface.
4. Pre-finish sanding. Move to Grit 220 (50-pack) to prepare for the finish, ensuring smooth and even absorption.
5. Final sanding. Use Grit 320 (100-pack) for a refined feel before applying stain, paint, or sealer.
6. Dust removal. Vacuum the surface and wipe with a tack cloth to remove fine particles.
7. Apply stain or paint. Apply evenly along the grain and let dry completely before adding the protective finish.
8. Apply protective finish. Use thin coats of polyurethane or another clear finish, sanding lightly with Grit 320 between coats for best results.

Special Cases

For doors with decorative carvings, hand-sand intricate areas to avoid removing too much detail. Consider starting with a finer grit to protect delicate features.

Pro Tips for Success

• Always sand in the direction of the wood grain for a cleaner finish.
• Replace sandpaper frequently to maintain efficiency.
• Use painter’s tape to protect glass panels or adjacent surfaces.

Aftercare

• Dust and clean regularly to maintain the finish.
• For exterior doors, reapply protective finish every few years.
• Address chips or scratches promptly to prevent moisture damage.

FAQs

• Do I need to remove the door to sand it? It’s best to remove it for even sanding and to avoid damaging nearby walls or floors.
• Can I sand over old paint? While possible, removing the old finish entirely ensures the most durable result.

Watch & Learn

By following this grit progression—from Grit 60 (10-pack) to Grit 320 (100-pack)—you can restore your wooden doors to a smooth, attractive, and long-lasting finish that enhances the look of your home.