How to Sand Car Paint for Blending Repairs (600, 800, 1000, 1500 Grit Guide)

When repairing scratches or chips on a vehicle, blending the new paint into the existing finish requires careful sanding. The right grit sequence ensures smooth transitions and invisible repair lines. This guide explains how to sand car paint for blending step by step using 600, 800, 1000, and 1500 grit sandpaper.

Why Sanding for Blending Matters

Blending involves feathering the edges of old and new paint. Sanding smooths these transitions and creates a surface profile that helps new paint bond seamlessly. Without sanding, repair areas may look uneven and stand out after polishing.

Tools You’ll Need

• 600–1500 grit wet/dry sandpaper – for feathering and blending.
• Sanding block – ensures even pressure across surfaces.
• Water spray bottle – essential for wet sanding finer grits.
• Automotive primer & paint – applied after sanding.
• Polishing compound & microfiber towels – for final blending.

Best Grit Sequence for Blending

• 600 grit: Levels edges and removes clear coat gloss.
• 800 grit: Refines scratches from 600 grit.
• 1000 grit: Smooths transition areas for blending.
• 1500 grit: Prepares surface for polishing and clear coat application.

Step-by-Step Blending Sanding

1. Start with 600 grit. Feather damaged paint edges with 600 grit (25-pack).
2. Smooth with 800 grit. Refine sanding marks using 800 grit (25-pack).
3. Refine with 1000 grit. Wet sand to soften transitions using 1000 grit (25-pack).
4. Finish with 1500 grit. Lightly wet sand using 1500 grit (50-pack) for a polish-ready surface.
5. Polish & blend. Buff the repaired area to merge seamlessly with surrounding paint.

Special Cases

For metallic paints, sanding up to 2000 grit before blending gives better results. For fresh clear coat, always wait until fully cured before sanding. When feathering, use light pressure to avoid cutting into base layers.

Pro Tips

• Always wet sand finer grits for smoother results.
• Work gradually—feather edges slowly instead of sanding aggressively.
• Check under good lighting to ensure transitions are invisible.
• Polish immediately after sanding for the best blend.

Aftercare

• Apply protective wax or ceramic coating after polishing.
• Wash with pH-neutral car shampoo to protect repairs.
• Inspect and touch up regularly to keep repairs hidden.

FAQs

• Do I need to sand the entire panel? No—only feather and blend around the repair area.
• Can I paint directly over 600 grit sanding? Primer yes, but refine further for basecoat blending.
• What grit is best before polishing? 1500 grit provides the ideal surface for buffing.

Watch & Learn

For seamless auto repairs, explore our metal sanding sandpaper collection.