How to Sand Deck Boards to Feather Edges

This guide shows how to sand deck boards to feather edges using a simple grit progression. All sheets are suitable for wet or dry use depending on dust control and finish goals.

Why Sanding Matters

Sanding levels high spots, removes weak material, and creates a consistent scratch pattern so primer, paint, varnish, or polish can bond evenly. The right progression prevents extra work because each step only removes the previous step’s scratches.

Recommended Tools

• Sanding block (flat and flexible)
• Vacuum or brush for dust control
• Microfiber cloth or tack cloth
• Masking tape for edges
• Work light (raking light)
• Optional: spray bottle for wet sanding

Recommended Grit Sequence

• 120 grit
• 150 grit
• 180 grit
• 220 grit

Step-by-Step

1. Prep: remove dust, protect edges, and secure the workpiece so it won’t shift.
2. Level and shape with 150 Grit (50). Keep the block flat and use light, even pressure.
3. Blend transitions with 180 Grit (100). Sand in a crosshatch pattern until scratches are uniform.
4. Refine the surface with 120 Grit (50). This reduces visible marks before coating or polishing.
5. Clean and inspect under a work light; spot-sand only where needed.
6. Final wipe: remove all dust before primer/paint/varnish or the next finishing step.

Special Cases

If the paper clogs, reduce pressure, clean the sheet, or switch to wet sanding where appropriate. For edges and corners, use shorter strokes and avoid over-sanding—edges cut faster.

Pro Tips

• Don’t skip grits unless the surface is already close to final smoothness.
• Change direction every few passes to verify scratch replacement.
• Stop as soon as the surface looks uniform under raking light.
• Replace sheets when cutting slows—fresh abrasive saves time.

Aftercare

• Vacuum thoroughly before applying coatings.
• Let wet-sanded surfaces dry fully before primer or paint.
• Store unused sheets flat and dry.
• Label leftover sheets by grit for the next project.

FAQs

• Wet or dry? Dry sanding is faster for leveling; wet sanding reduces dust and can refine the finish.
• When do I move up a grit? When the scratch pattern is even with no shiny islands.
• Why do I see scratches later? Usually from jumping too far in grit or not fully replacing the previous scratches.

Watch & Learn

Pause at each grit change and compare the scratch pattern under a work light—uniform scratches mean you’re ready to step up.

Need more options for your next project? Shop all sandpaper.