How to Sand a Guitar Body for Refinishing (150, 220, 320, 400 Grit Step-by-Step Guide)

Refinishing a guitar body is one of the most rewarding DIY projects for musicians and hobbyists. Whether you want to repaint, stain, or simply refresh the wood, proper sanding ensures that the finish looks smooth, professional, and durable. In this guide, we’ll cover how to sand a guitar body step by step using 150, 220, 320, and 400 grit sandpaper.

Why Sanding a Guitar Matters

Guitars are precision instruments, and their finish isn’t just about looks. A smooth finish improves playability, protects the wood, and enhances the overall tone resonance. Skipping or rushing the sanding stage often results in blotchy paint jobs or finishes that peel prematurely.

Benefits of proper sanding:

• Surface preparation: Removes old paint, lacquer, or imperfections.
• Improved adhesion: Ensures primer and paint bond strongly to the wood.
• Smooth feel: Eliminates rough patches that affect comfort while playing.
• Professional appearance: Makes the guitar look polished and high quality.

Choosing the Right Grits

• 150 grit: Removes old finish, paint, or stubborn lacquer.
• 220 grit: Refines scratches left by coarse sanding.
• 320 grit: Creates a smooth surface ideal for primer or stain.
• 400 grit: Final sanding pass for a silky, paint-ready finish.

Tools and Supplies

• Sandpaper sheets: Versatile wet/dry sheets in 150, 220, 320, and 400 grits.
• Sanding block: Helps keep flat areas even and prevents gouging.
• Detail sander or sponge: Ideal for curves and tight corners on the guitar body.
• Tack cloth: Removes fine dust before finishing.
• Drop cloth: Protects your workspace from dust and debris.

Step-by-Step Sanding Guide

1. Start with 150 grit. Use 150 grit (25-pack) to strip old paint or lacquer. Work evenly, especially on flat areas, but avoid oversanding curved edges.
2. Smooth with 220 grit. Switch to 220 grit (100-pack) to refine the surface and remove scratches from 150 grit.
3. Prepare with 320 grit. Apply 320 grit (25-pack) to achieve a smooth, primer-ready surface.
4. Finish with 400 grit. Use 400 grit (100-pack) for the final sanding pass. This ensures a silky feel and flawless paint adhesion.

Special Considerations

Curves and contours: Use flexible sanding sponges or hand-sand these areas carefully.

Vintage guitars: If refinishing a collectible instrument, consider professional restoration to preserve value.

Wood type: Softer woods like basswood require lighter sanding, while harder woods like ash may need more time with coarse grits.

Pro Tips

• Sand with the grain to avoid visible scratches.
• Don’t oversand edges—keep the guitar’s shape intact.
• Clean dust thoroughly before applying primer or stain.
• Use light, even pressure to avoid gouges.
• Test sanding progression on a scrap piece of wood if available.

Aftercare Before Finishing

• Apply a primer or sanding sealer after the final 400 grit sanding.
• For staining, use a wood conditioner to prevent blotching.
• Lightly sand between coats of paint or lacquer with 400 grit for a flawless finish.

FAQs

• Can I skip 150 grit? Only if the guitar already has a bare wood surface without finish.
• Do I need to wet sand? Wet sanding is optional for 400 grit but helps achieve ultra-smooth results.
• Will sanding change the guitar’s tone? No—sanding only affects finish, not sound quality.
• Should I sand the neck too? Only if refinishing the neck—be extra careful with fret areas.

Watch & Learn

Shop guitar refinishing sandpaper: Get 150, 220, 320, and 400 grit sheets in convenient packs. Shop fine grit sandpaper.

Closing Thoughts

Sanding a guitar body requires patience and attention to detail. By working through 150 → 220 → 320 → 400 grits, you’ll create a smooth surface that’s perfectly prepared for painting or staining. The right sanding sequence not only improves the appearance but also ensures a durable finish that will last for years of playing.