what grit sandpaper for a car

[McCole]

For most car sanding projects, you'll need a range of sandpaper grits, but starting with 400-grit for light scratches and moving up to 2000-grit for final polishing is the standard approach. The correct grit depends entirely on your goal: removing clear coat scratches, smoothing primer, or preparing for a full repaint. Using too coarse a grit can cause irreversible damage to your car's paint.

The sandpaper grit number indicates the size of the abrasive particles glued to the paper. A lower number means coarser, more aggressive grit for heavy material removal, while a higher number signifies a finer grit for smoothing and polishing.

Project Goal	Initial Grit (Coarse)	Intermediate Grit (Medium)	Final Grit (Fine)	Key Consideration
Removing Deep Primer/Base Coat	320-grit	400-grit	600-grit	Always used with a dual-action sander; never on factory clear coat.
Smoothing Body Filler	80-grit	180-grit	320-grit	For shaping filler only, not for paint. Follow with primer.
Feathering Edge a Paint Chip	800-grit	1000-grit	1500-grit	Tapers the edge of the existing paint to blend with new primer.
Sanding Clear Coat (Wet Sanding)	1000-grit	1500-grit	2000-grit to 3000-grit	Used with water and soap to remove orange peel or light scratches.
Final Polishing Prep	2000-grit	2500-grit	3000-grit	Precedes compounding and polishing to restore gloss.

For a beginner, the most common and safest task is wet sanding to remove minor clear coat defects. This involves using 1000-grit to 3000-grit sandpaper with plenty of water and a drop of soap as a lubricant. Always follow sanding with a machine polisher and compound to remove the micro-scratches and restore the shine. Test your technique on an inconspicuous area first.

[HaileyRose]

Honestly, if you're just trying to smooth out a small scratch before using a touch-up pen, don't overthink it. Grab a 1500-grit sandpaper from the auto parts store. Use it wet—just dip it in a bucket of water with a tiny bit of car wash soap. Gently feather the area, and for goodness sake, don't press down hard. You're just scuffing it so the new paint has something to grip. Follow up with some polishing compound by hand to bring the shine back. Easy.

[SanMiguel]

The biggest mistake is going too coarse. I learned the hard way. For smoothing primer before painting, start with 400-grit to level it, then move to 600-grit for a finer finish. The key is using a sanding block to keep things even. If you're sanding by hand, you'll create dips and waves. After 600-grit, the surface should feel like smooth glass. Any rougher, and the final paint job will look terrible. It’s all about the foundation.

[AnastasiaDella]

It's not just about the grit number; it's about the tool. If you're using a dual-action (DA) sander for a larger area, you can start with a slightly more aggressive grit, like 500 or 600, because the tool's random motion is less likely to cause gouges. For hand sanding, you need to be much finer, starting at 800 or 1000. Always use a backing pad with the sander. The right tool with the right grit makes the job ten times faster and safer for your car's panels.

[AlinaRose]

Don't forget the material. For dry sanding metal or filler, standard aluminum oxide sandpaper is fine. But for wet sanding clear coat, you must use silicon carbide sandpaper, which is designed to be used with water. The water washes away the sanding debris, prevents the paper from clogging, and keeps the surface cool to avoid burning the paint. They sell it in small sheets or pre-cut pads. Using the wrong type of paper will just make a mess and give you poor results.