Sanding Polyurethane Finishes: 220–1500 Grit Sandpaper Sheets

Applying polyurethane protects wood surfaces, but without sanding between coats, you may end up with bubbles, dust nibs, or uneven layers. The key to a glass-smooth finish is using 9x11 inch sandpaper sheets in the right grit sequence. eQualle’s wet dry silicon carbide sandpaper sheets make it easy to achieve professional-quality results.

Why Sand Polyurethane?

Sanding between coats levels imperfections and creates tiny scratches that help the next coat bond. Without sanding, the finish can peel or look rough instead of glossy and smooth.

Tools You’ll Need

• eQualle fine sandpaper sheets
• Sanding block or pad
• Tack cloth or microfiber rag
• Polyurethane and applicator brush
• Protective gloves and mask

Best Grits for Polyurethane Sanding

• 220 grit — First sanding between coats. 220 Grit (100-pack).
• 320 grit — Smooths and evens surfaces for additional coats. 320 Grit (25-pack).
• 600 grit — Refines final coats before polishing. 600 Grit (50-pack).
• 1500 grit — Creates a satin-to-gloss finish before buffing. 1500 Grit (25-pack).

Step-by-Step Polyurethane Sanding

1. Start with 220 grit sandpaper sheets. Lightly sand after the first coat cures to remove raised grain and dust nibs.
2. Switch to 320 grit. Sand gently between additional coats to ensure smooth layering.
3. Move to 600 grit sandpaper sheets. Use for the last coat sanding, especially if you want a satin finish.
4. Finish with 1500 grit. Wet sand lightly for an ultra-smooth, glass-like surface before polishing.

Special Cases

For oil-based polyurethane, wait at least 24 hours before sanding. For water-based polyurethane, you may sand after 6–8 hours depending on humidity.

Pro Tips

• Always sand lightly—avoid cutting through coats.
• Use wet dry sandpaper sheets for grits 600 and above.
• Wipe with tack cloth before recoating to prevent dust contamination.
• Let the final coat cure fully before polishing or buffing.

Aftercare

• Buff cured polyurethane with polishing compound for maximum gloss.
• Store leftover sheets flat and dry for future finishing projects.
• Keep a set of assorted grit sandpaper sheets handy for touch-ups.

FAQs

• Do I need to sand after every coat? Yes—light sanding ensures adhesion and smoothness.
• Can I skip to 1500 grit? No—each grit removes scratches from the previous one.
• Which pack is best? A 220 Grit (100-pack) is the most useful for repeated sanding between coats.

Watch & Learn

For flawless finishes, trust eQualle 9x11 in sandpaper sheets. Explore the full range in the Fine Sandpaper Collection.