How to Sand a Car Before Painting: From Old Paint Removal to Final Prep (80–600 Grit Guide)

Prepping a car for a new paint job is all about surface perfection. Whether you’re restoring a classic or touching up panels, proper sanding ensures that your primer and paint adhere flawlessly. This guide walks you through the grit sequence, tools, and steps for professional auto body results.

Why Sanding is Crucial Before Painting a Car

Old paint, clear coat, and surface imperfections can prevent proper adhesion. Sanding not only removes these issues but also creates a fine texture for primers and topcoats to grip.

Tools & Materials

• Dual-action (DA) sander or sanding block
• Automotive masking tape and paper
• Wax and grease remover
• Wet/dry sandpaper in various grits
• Respirator mask and safety glasses

Recommended Grit Sequence

• 80 grit: Stripping old paint and heavy surface prep.
• 180 grit: Smoothing after paint removal.
• 320 grit: Preparing for primer application.
• 600 grit: Final wet sanding before basecoat or clear coat.

Step-by-Step: Sanding a Car for Paint

1. Clean and mask. Wash the car and mask off trim, glass, and areas you’re not painting.
2. Strip old paint. Use 80 grit (50-pack) to remove paint and rust from panels.
3. Refine the surface. Smooth with 180 grit (25-pack) to remove deep scratches and prepare for finer sanding.
4. Primer prep. Sand with 320 grit (100-pack) for an even, primer-ready surface.
5. Final wet sand. Before basecoat or clear coat, use 600 grit (25-pack) wet to achieve a smooth, defect-free surface.
6. Clean thoroughly. Remove all dust and residue with wax and grease remover.
7. Prime and paint. Apply automotive primer, then your chosen basecoat and clear coat.

Special Cases

For spot repairs, feather the edges with 320 grit before priming to blend new and old surfaces seamlessly.

Pro Tips

• Always wet sand finer grits (320 and up) to prevent clogging and reduce heat.
• Work in a dust-free environment to minimize contamination.
• Check progress under good lighting to catch imperfections early.

Aftercare

• Allow paint to fully cure before waxing or polishing.
• Store leftover sandpaper flat in a dry place.

FAQs

• Can I skip the 180 grit stage? Not recommended—this step removes deep 80 grit scratches that primer alone won’t fill.
• Do I need a DA sander? It speeds up work, but hand sanding can achieve similar results with patience.

Watch & Learn

Get your panels paint-ready with the perfect grit sequence. Shop all wet/dry sandpaper sheets today.