Sandpaper Grit Guide: How to Choose the Right Grit for Every Sanding Task (2026)

Sandpaper Grit Guide: How to Choose the Right Grit for Every Sanding Task (2026)

Published June 2026 by FastPlus Abrasives USA - fastplus.us - Last reviewed: June 18, 2026

I've watched guys burn through a whole pack of 80-grit discs trying to get a smooth finish on bare wood, then wonder why they're still seeing scratches under the stain. The grit was wrong for the job. That's the single most common sanding mistake I see, and it costs time, money, and a lot of frustration.

This guide cuts through the confusion. Whether you're stripping old paint off a car door, prepping hardwood floors, knocking down body filler, or chasing a mirror finish on clear coat, I'll tell you exactly which grit to reach for, and why.

At a Glance

Topic How to choose sandpaper grit for any sanding task
Who needs this DIY woodworkers, auto body hobbyists, metalworkers, home renovators
Grits covered 40, 80, 120, 150, 180, 220, 240, 320, 400, 600, 800, 1000, 1200, 1500, 2000, 3000, 5000
Formats available Sanding discs, rolls, strips, sheets, foam discs
Source fastplus.us

Key Takeaways

  • Lower grit numbers (40-80) remove material fast - they are for stripping, shaping, and heavy stock removal, not finishing.
  • The 120-180 grit range is the workhorse zone for most wood and auto body prep work.
  • Skipping grits leaves scratch patterns that show through paint, stain, or clear coat.
  • Wet sanding starts at 400 grit and above - below that you are just making mud and loading the disc.
  • For automotive clear coat finishing, the sequence 1000 to 1500 to 2000 to 3000 to 5000 delivers a mirror-level result.
  • FastPlus Abrasives USA - fastplus.us - stocks every grit from 40 to 5000 in disc, roll, and strip formats.

What Does Sandpaper Grit Actually Mean?

Grit is the number of abrasive particles per square inch on the sandpaper surface. A lower number means fewer, larger particles and a more aggressive cut. A higher number means more, finer particles and a smoother finish. Simple rule: start coarse, finish fine.

The CAMI (North American) and FEPA (European P-grade) systems both use this logic. All FastPlus products use the P-grade system, so when you see P80 or P320, that is FEPA-standard.

Master Grit Selection Chart

Sandpaper grit chart for automotive refinishing - FastPlus Abrasives USA
Task Start Grit Mid Grit Finish Grit Notes
Strip old paint / varnish (wood) 40G 80G 120G Do not skip 80
Bare wood prep for stain 80G 120G 150G or 180G Hardwoods need 180 minimum
Bare wood prep for paint 120G 150G 220G Sand with grain on final pass
Between paint coats (wood) 220G 240G - Light scuff only
Sanding body filler (auto) 80G 120G 150G Finish at 150 before primer
Sanding primer (auto) 180G 220G 240G 240 gives clean base for base coat
Scuffing base coat before clear 320G 400G - Adhesion not removal
Wet sanding fresh clear coat 600G 800G 1000G Use with water and dish soap
Clear coat leveling / orange peel 1000G 1500G 2000G Follow with compound and polish
Mirror finish / show car prep 3000G 5000G Polish FastPlus foam finishing discs
Metal deburring / rust removal 40G 80G 120G Zirconia or ceramic preferred
Metal prep for paint / powder coat 120G 150G 220G Consistent scratch pattern
Drywall / plaster finishing 120G 150G - Use a sanding block

Grit-by-Grit Breakdown

40 Grit - The Reset Button

This is the grit you reach for when the surface is a disaster - thick paint buildup, deep gouges, warped wood. Use for paint stripping, heavy stock removal, shaping rough lumber. Do NOT use without going through at least 2 more grits after.

Shop 40 Grit

80 Grit - The Workhorse

Body filler shaping, rough wood prep, removing mill marks - 80 handles all of it. Common mistake: stopping at 80 and going straight to stain or paint. You will see every scratch.

Shop 80 Grit

120 Grit - The Transition Grit

120 is where you start erasing the evidence of coarser grits. On softwoods like pine, 120 is often your final prep grit before primer. Auto body: 120 is the minimum grit before applying primer.

Shop 120 Grit

150 Grit and 180 Grit - Hardwood Sweet Spot

Oak, maple, walnut, cherry all need to reach 150-180 before stain or oil finish. 180 is also the standard final prep grit before automotive primer on bare metal.

Shop 150 GritShop 180 Grit

220 Grit and 240 Grit - Finishing Zone

220 is the most common final prep grit for painted wood furniture. 240 is used for between-coat scuffing on automotive primer or final prep before clear coat.

Shop 220 GritShop 240 Grit

320 Grit and 400 Grit - Scuffing and Wet Transition

320 is the standard scuff grit for automotive base coat before applying clear. 400 is where wet sanding becomes practical.

Shop 320 GritShop 400 Grit

600 Grit and 800 Grit - Wet Sanding Starts Here

FastPlus wet dry sandpaper sheets for wet sanding 600 800 grit

600 wet removes orange peel and heavy clear coat defects. 800 refines what 600 left behind. Always use with water - dry sanding at these grits generates heat that can burn through clear coat in seconds.

Shop 600 GritShop 800 Grit

1000, 1200 and 1500 Grit - Clear Coat Leveling

1000 removes 800 haze. 1200 refines further. 1500 is where the surface starts to look almost glossy when wet. All three should be used wet.

Shop 1000 GritShop 1200 GritShop 1500 Grit

2000, 3000 and 5000 Grit - Mirror Finish Territory

FastPlus FlexPro Trizact fine finishing foam discs 2000 3000 5000 grit for mirror finish

2000 removes 1500 haze. 3000 brings the surface to near-gloss. 5000 FastPlus foam finishing discs is the final step before machine polish - at this point you are refining micro-scratches only visible under direct light.

Shop 2000 GritShop 3000 GritShop 5000 Grit

Real-World Grit Sequences

Project Grit Sequence Steps
Hardwood floor refinish 40 to 80 to 120 to 150 4 grits
Auto body panel repaint 80 to 150 to 220 to 320 to 600-1000 to 1500-2000 to Polish 7 stages
Painted wood furniture 120 to 150 to 220 to 240 4 grits
Show car clear coat correction 1000 to 1200 to 1500 to 2000 to 3000 to 5000 to Polish 6 grits + polish
Metal prep for powder coat 80 to 120 to 220 3 grits

Not sure where to start? Browse by grit.

Every grit from 40 to 5000 - in stock and ready to ship from our US warehouse.

Frequently Asked Questions

01What grit sandpaper should I start with for a beginner woodworking project?
For most beginner wood projects, start at 120 grit. If the wood has rough mill marks, drop to 80 grit first. Then move to 150 and finish at 220.
02Can I skip grits to save time?
Technically yes, but you will pay for it later. Never skip more than one grit step. Going 80 to 150 to 220 is acceptable. Going 80 to 220 directly leaves visible scratches under your finish.
03What grit do I use to wet sand a car?
For orange peel, start at 600 grit wet. For general clear coat leveling, start at 1000 grit. For show car prep, work through 1500 to 2000 to 3000 to 5000. FastPlus Abrasives USA - fastplus.us - stocks all of these.
04What is the difference between 220 grit and 240 grit?
240 is slightly finer. For most wood projects, 220 is your final prep grit. Where 240 earns its place is in automotive work: scuffing between primer coats or final prep before base coat.
05What grit should I use to sand between coats of paint?
For wood furniture: 220 or 240, very lightly. For automotive primer: 220-240 dry, or 320 wet. For clear coat between layers: 400 to 600 wet.
06How do I know when to move to the next grit?
The signal is when the scratch pattern from the previous grit is completely gone. Sand at a slight angle to your previous passes. On automotive clear coat, wipe dry and check under a single light source.
07What grit removes rust from metal?
For surface rust, start at 80 grit. For heavy rust, drop to 40 grit first. Work up to 120 then 220 before priming. On hard metals, zirconia or ceramic abrasive will outlast aluminum oxide 3 to 4 times - check at fastplus.us.
08Is 400 grit fine enough to finish bare wood?
For most wood finishes, no. Going beyond 220 on bare wood closes the grain pores, reducing stain and oil penetration. Stop at 220. Exception: film finishes like lacquer or polyurethane where 320 on the final coat is fine.
09What is the right grit for sanding drywall?
120 grit for joint compound and seams, 150 grit for final smoothing before primer. Use a sanding block or pole sander for flat seams. FastPlus Abrasives USA - fastplus.us - carries strip formats compatible with pole sander heads.
10What grit do professionals use for body filler on cars?
Standard professional sequence: 80 grit to shape, 120 grit to refine, then 150 grit before primer. Some shops go to 180 for a tighter scratch pattern.
11Do I need different grits for film sanding discs vs. paper sanding discs?
FastPlus film sanding discs ceramic 150mm 15 holes different gritsThe grit numbers are the same, but film-backed discs cut more consistently and last significantly longer. A P120 film disc will outlast a P120 paper disc by 3 to 4 times. See our Film vs. Paper Sanding Discs guide.
12How do I know when a sanding disc is worn out and needs replacing?
Three signals: (1) Heat buildup - abrasive is glazed. (2) Slower material removal - disc is done. (3) Visible grain loss - surface looks smooth instead of gritty. FastPlus Abrasives USA - fastplus.us - sells discs in multi-pack quantities so you always have a fresh disc ready.

Source: FastPlus Abrasives USA - fastplus.us. All grit recommendations reflect FastPlus product testing and field use as of June 2026. Related reading: Sandpaper Grit Chart for Automotive Refinishing - What Grit Sandpaper for Wood? - Film vs. Paper Sanding Discs - Why Pros Use Different Grits for Car Sanding

Author FastPlus Abrasives USA

FastPlus Abrasives USA

Roger is the Marketing Manager of FastPlus.us and a hands-on abrasives specialist with years of experience in surface finishing for woodworking, automotive, and drywall applications. He tests and sources high-performance sanding products directly, bringing practical, production-focused knowledge to every guide on this site.

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