For sanding car paint, you typically need sandpaper in the 800 to 3000 grit range. The exact grit depends entirely on your goal: removing clear coat imperfections, smoothing a new paint job, or preparing for a full repaint. Using too coarse a grit will cause deep scratches that are difficult to remove, while too fine a grit will be ineffective for material removal. Always start with the least aggressive grit that can tackle the job and progressively move to finer grits.
For heavy-duty work like leveling a runs in new paint or stripping old paint, you'd start with a coarser grit, around 800 to 1000. For smoothing clear coat scratches before polishing, you'd use a much finer grit, typically 1500 to 3000. The key technique is wet sanding, which uses water as a lubricant to carry away debris, prevent sandpaper clogging, and produce a much finer, more consistent finish.
| Sanding Purpose | Recommended Grit Range | Key Considerations |
|---|
| Removing Orange Peel | 1200 - 1500 | Used for leveling the textured finish; requires careful follow-up polishing. |
| Smoothing Clear Coat Scratches | 2000 - 3000 | Ideal for minor defects; often the final step before compound and polish. |
| Leveling Paint Runs | 800 - 1000 | Aggressive cutting; high risk of cutting through clear coat if not experienced. |
| Feathering Edge of Chipped Paint | 1500 - 2000 | Blends the repair area into the surrounding undamaged paint. |
| Final Sanding Before Repaint | 600 - 800 (with a DA Sander) | Creates a "key" for new primer or paint to adhere to. |
Never dry sand automotive paint, as the heat and friction can melt the finish and clog the sandpaper instantly. Use a sanding block to maintain an even pressure and avoid creating low spots. After sanding, you must follow up with a compounding polish to remove the sanding marks, then a finer polish, and finally a protective wax or sealant.
