How to Sand Between Coats of Polyurethane on Wood: Expert Tips for a Smooth Finish

Applying multiple coats of polyurethane is key to protecting and beautifying wood surfaces, but sanding between coats ensures a smooth, flawless finish. This SEO-optimized guide explains why and how to sand between polyurethane coats, the best sandpaper grits to use, and tips for achieving professional results on furniture, floors, and cabinetry.

Why Sand Between Polyurethane Coats?

Sanding between coats removes dust nibs, bubbles, and unevenness, helping the next layer adhere better and creating a more durable, glossy surface.

Best Sandpaper Grits for Between-Coat Sanding

• 320–400 grit sandpaper: Ideal for light sanding between coats.
• 600 grit sandpaper: For ultra-smooth finishing before the final coat.

Step-by-Step: How to Sand Between Polyurethane Coats

1. Allow each coat to dry fully—typically 4 to 6 hours or as directed by the product.
2. Use 320–400 grit sandpaper to lightly sand the surface with gentle, even pressure.
3. Remove all sanding dust with a tack cloth or vacuum and damp cloth.
4. Apply the next coat of polyurethane.
5. Repeat sanding between coats until the final layer.

Pro Tips for Smooth Polyurethane Finishes

• Sand by hand or with a fine sanding block for even results.
• Use silicone carbide sandpaper for longer-lasting grit and cleaner sanding.
• Work in a dust-free, well-ventilated area for best results.

FAQs

• Can I skip sanding between coats? Skipping sanding often results in a rough or peeling finish.
• Is wet sanding better between coats? Dry sanding with fine grit is standard; wet sanding is less common between coats.

Watch & Learn

Shop premium sandpaper for finishing at eQualle and explore more finishing tips on our DIY blog.