Best Paper Abrasive for Smoothing Wood Between Coats: A Guide for Wood Finishing

In woodworking and furniture finishing, the step of sanding between coats is critical to achieving a smooth, professional surface. Whether applying varnish, lacquer, polyurethane, or paint, choosing the best paper abrasive for smoothing wood between coats can significantly affect the final appearance and durability of the finish. Unlike rough sanding, this stage focuses on refinement, not material removal.

 

Why Sanding Between Coats Matters

Between-coat sanding removes dust nibs, brush marks, and minor surface imperfections that appear after each layer of finish dries. It also creates a slightly abraded surface that helps the next coat adhere more evenly. Using the wrong abrasive can damage the finish or cut through to bare wood, making grit selection especially important at this stage.

 

Recommended Grits for Between-Coat Sanding

For most wood finishing applications, fine to very fine grit paper abrasives are ideal.

• 220–240 grit is commonly used after the first coat, especially if the wood grain has raised. It smooths the surface without removing too much finish.

• 320 grit is one of the most popular choices for sanding between coats. It effectively removes small imperfections while leaving a uniform surface for the next layer.

• 400 grit and higher are best for final smoothing or for delicate finishes where minimal abrasion is required.

Using progressively finer grits helps maintain a consistent finish and reduces the risk of visible sanding marks in the final coat.

 

Best Types of Paper Abrasives for Between Coats

Silicon carbide paper is widely considered one of the best paper abrasives for between-coat sanding. It offers sharp, uniform abrasive particles and works exceptionally well for both dry and wet sanding. Wet sanding with silicon carbide paper helps minimize dust and prevents clogging, making it ideal for clear coats and high-gloss finishes.

Aluminum oxide paper is another reliable option. It is durable and long-lasting, making it suitable for light sanding between coats, especially on polyurethane or water-based finishes.

 

Dry Sanding vs. Wet Sanding

Dry sanding is quick and convenient for light touch-ups, while wet sanding provides superior control and a smoother result. When wet sanding, using water or a mild lubricant reduces friction and helps achieve an ultra-smooth surface. Very fine grits, such as 600 or 800, are commonly used in wet sanding applications.

 

Best Practices for Optimal Results

Always sand lightly using even pressure and avoid staying in one spot for too long. A sanding block or soft pad can help maintain consistent contact on flat surfaces, while folded paper works well for edges and contours. After sanding, remove dust thoroughly before applying the next coat.

 

In conclusion, the best paper abrasive for smoothing wood between coats is a fine-grit, high-quality option such as silicon carbide or aluminum oxide paper. When used correctly, these paper abrasives help create a flawless, smooth finish that enhances both the appearance and longevity of wood projects.