What grit sequence do I use for polishing concrete?

A standard progression is 50, 100, 200, 400 (metal bond) then 100, 200, 400, 800, 1500, 3000 (resin bond). The metal-to-resin transition happens around 200-400 grit depending on the system.

Can I skip grits when polishing concrete?

No — skipping grits leaves visible scratches from the coarser step that the finer grit can't remove. Each grit must fully refine the surface before moving to the next.

What's the difference between metal bond and resin bond polishing?

Metal bond pads are more aggressive and used for initial grinding/honing (50-400 grit). Resin bond pads are softer and used for polishing to a shine (100-3000 grit). You transition from metal to resin mid-sequence.

Concrete Polishing Grit Progression Guide

The grit progression is the backbone of concrete polishing — skip a step and the final result will show it. This concrete polishing grit progression guide covers the standard sequence, the metal-to-resin transition, where densifiers fit in, and how to diagnose problems at each stage.

The Standard Concrete Polishing Grit Progression

A full polishing sequence involves two tooling categories: metal bond (for grinding) and resin bond (for polishing). The transition happens mid-sequence.

Metal Bond Steps (Grinding Phase)

Grit	Purpose	What You’ll See
30-50	Remove coatings, flatten surface, expose aggregate	Rough, scratched surface
100	Refine 50-grit scratches	Smoother but still hazy
200	Final metal bond step (on most systems)	Even, consistent haze

Densifier Application

Apply lithium silicate densifier between the final metal bond step and the first resin bond step (typically after 200-grit metal). The densifier hardens the concrete, fills micro-pores, and creates a surface that resin pads can polish to a higher gloss. Allow the densifier to fully absorb and cure per manufacturer instructions before proceeding.

Resin Bond Steps (Polishing Phase)

Grit	Purpose	What You’ll See
100	First resin step — begin polishing	Slight sheen emerging
200	Refine	Noticeable sheen
400	”Satin” finish	Clear sheen, most commercial floors stop here
800	”Semi-polished”	Reflective surface
1500	”Polished”	High gloss, distinct reflections
3000	”Mirror” finish	Maximum reflectivity

The Golden Rule of This Concrete Polishing Grit Progression: Don’t Skip Grits

Each grit removes the scratch pattern of the previous grit. If you skip from 100 to 400, the 400-grit pad can’t efficiently remove the deep 100-grit scratches — you’ll either spend enormous time or end up with visible scratches in the final finish.

The test: after completing each grit level, the surface should show a uniform scratch pattern from that grit only. If you see deeper scratches from a previous grit, you haven’t fully refined the surface — go back and redo the current grit until the old scratches are gone.

Stopping Points in the Concrete Polishing Grit Progression

Not every floor needs to go to 3000 grit. Common stopping points:

400 grit — “Satin” finish. Clean, professional look without high gloss. Most commercial and industrial floors. Easiest to maintain.
800 grit — “Semi-polished.” Clear sheen, visible reflections. Popular for retail and office spaces.
1500 grit — “Polished.” High gloss. Showrooms, lobbies, high-end residential.
3000 grit — “Mirror.” Maximum reflectivity. Decorative floors, high-end commercial.

Troubleshooting

Scratches visible after completing a grit: You didn’t fully refine the surface at the previous grit. Go back one step and redo it.

No sheen developing by 400 grit: Densifier may not have fully penetrated or cured. Or the concrete is too soft (low PSI) to take a polish — may need additional densifier applications.

Inconsistent gloss across the floor: Uneven grinding at early steps. The floor wasn’t flat enough before transitioning to resin. Go back to metal bond and re-level.

For pad selection, see Polishing Pad Buying Guide and Best Polishing Pads for Concrete. For step-by-step technique, see How to Polish Concrete Floors. For the initial metal-bond grinding phase that comes before polishing, see How to Grind a Concrete Floor.

Stopping Points by Finish Goal

Most jobs don’t need the full 8-step progression. Stop where the finish brief says to stop. Going further wastes pad life and labor; stopping short leaves the floor below spec.

Finish Goal	Final Grit	Sheen Level	Typical Use
Salt-and-pepper matte	200-400	Low (5-15 gloss units)	Warehouses, garages, industrial floors
Satin / honed	800	Medium (20-40 GU)	Retail, restaurants, residential basements
Semi-polished	1500	Medium-high (40-60 GU)	Commercial showrooms, light retail
Full polish (mirror)	3000	High (60-80+ GU)	Luxury retail, hotel lobbies, premium residential

The transition between grinding and polishing is the densifier application. Apply lithium-silicate densifier after the 200-grit metal-bond pass — it chemically hardens the surface so the resin pads can mirror-polish instead of just smearing. Skip the densifier and the higher grits create haze rather than gloss.

Common Grit-Progression Mistakes

Skipping grits is the most common error. Jumping 100 → 800 leaves scratches from the 100 step that the 800 pad can’t remove. Each step removes the scratch pattern of the previous step — skip a step and the scratches stay. The cost is real: a botched skip-the-step job requires regrinding back to the deepest visible scratch, wasting all the progress made.

Wrong bond at the wrong stage is the second most common. Metal-bond pads belong in stages 30-200 (aggressive removal). Resin-bond pads belong in stages 400-3000 (refining). Run a metal pad at 800 grit and you grind, not polish.

Insufficient pad rotation — pads need to be checked every 500-1,000 square feet for even wear. Polishing with a worn-out pad produces inconsistent gloss.

Recommended Polishing Pads

Virginia Abrasives manufactures diamond polishing pads — check the VA Amazon store for current availability and pad sets. For diamond blades and grinding tools to use alongside your polishing work, browse the full VA lineup.

Browse Virginia Abrasives on Amazon →

Recommended Products

Diamond Polishing Pads

Stadea 4” Wet/Dry 8-Piece Set — industry standard for concrete and stone polishing
POLISHSURF 11+1 Set with Backer Pad — includes backing pad and polishing guide

Grinding Tools (Surface Prep Phase)

VA Ultra Value Diamond Blade — for initial grinding before polishing
Browse All VA Products →

Virginia Abrasives does not manufacture polishing pads. We recommend Stadea and POLISHSURF based on professional use and reviews. VA grinding cup wheels are recommended for the metal-bond grinding phase.

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