eQualle Sandpaper Sheets for Sanding Between Coats of Polyurethane (220–600 Grit Guide)

Applying multiple coats of polyurethane gives wood surfaces durability and a rich finish, but sanding between coats is essential for a flawless result. eQualle 9x11 inch Wet/Dry Sandpaper Sheets provide the grit sequence needed to smooth layers and prepare for the next coat.

Why Sanding Between Coats Matters

Each layer of polyurethane can leave behind dust nibs, brush strokes, or bubbles. Sanding smooths these imperfections, ensuring the next coat bonds well and creates a silky, professional finish.

Tools You’ll Need

• Sanding block or sponge
• Vacuum and tack cloth
• Polyurethane (oil- or water-based)
• Microfiber cloths
• eQualle Wet/Dry Sandpaper Sheets

Best Sandpaper Grits for Polyurethane Coats

• 220 Grit (100-pack) — Smooths the first coat for better adhesion.
• 320 Grit (25-pack) — Refines surfaces for mid-coat sanding.
• 400 Grit (50-pack) — Provides ultra-smooth sanding before final coats.
• 600 Grit (25-pack) — Lightly sands the final coat for a silky finish.

Step-by-Step: Sanding Between Coats

1. Apply the first coat. Let polyurethane dry fully according to manufacturer instructions.
2. Sand with 220 grit. Smooth the first coat lightly to remove dust and bubbles.
3. Apply second coat. Brush or spray evenly, then allow to dry.
4. Switch to 320 grit. Sand gently to refine texture before the next coat.
5. Use 400 grit. Sand lightly between final coats for a glass-like surface.
6. Finish with 600 grit. Lightly sand the cured surface for silky smoothness.
7. Polish (optional). Buff with compound or wax for added sheen.

Special Cases

For water-based polyurethane, sanding with finer grits (320–600) is best to avoid cutting too deep. For oil-based finishes, 220 grit provides good adhesion between coats.

Pro Tips

• Always sand lightly—just enough to dull the surface and remove imperfections.
• Use tack cloth after sanding to eliminate fine dust.
• Let each coat dry fully before sanding to prevent clogging paper.

Aftercare

• Allow the final coat to cure fully (up to 7 days for oil-based) before heavy use.
• Clean wood surfaces with a damp cloth—avoid harsh cleaners.
• Reapply polyurethane every few years for long-term protection.

FAQs

• Do I always need to sand between coats? Yes, for proper adhesion and smoothness.
• Can I sand too much? Yes, avoid sanding through to bare wood.
• What grit is best for the last coat? 400–600 grit for a silky finish.

Watch & Learn

Get silky, durable finishes with eQualle Sandpaper Sheets (9x11 in, Wet or Dry). Explore the fine sanding collection for your next woodworking project.