Polished concrete is the slab itself: we grind the top with diamond tooling, harden it with a densifier and polish it with finer and finer diamonds until it shines. We polish concrete and also coat it in epoxy, and we test a slab for moisture before any floor work. For a free estimate, call or text (805) 698-9745.
Polished or coated?
| Compare | Polished concrete | Epoxy coating |
|---|---|---|
| What it is | The slab’s own surface, ground and polished | A coating bonded on top of the slab |
| Look | Gray concrete, from matte to high gloss, with as much stone showing as you choose | A solid color, or color flakes under a clear coat |
| Where it fits | Living areas, studios, shops and commercial floors | Garages and utility rooms, where oil and tires meet the floor |
| Damp slab | No film on top to lift | Moisture can lift a coating, so the slab is tested first |
How a slab gets polished
- Test and prepare. We test the slab for moisture, fill cracks, and take off old glue, paint and coatings.
- Grind. Metal-bond diamonds flatten the surface and open it up. The depth of the cut decides how much stone shows.
- Densify. A liquid hardener soaks in and hardens the surface so it takes a polish and resists wear.
- Polish. Resin-bond diamonds go on in steps, each one finer, until the floor reaches the sheen you chose.
- Protect. An optional guard coat helps the surface shrug off stains.
How shiny, and how much stone?
A polished floor is graded two ways: how much it reflects and how much stone shows. These are Concrete Network’s levels:
| Level | Look | Where the polishing stops |
|---|---|---|
| 1, flat | Little or no reflection | Below 100 grit |
| 2, satin | Low sheen | About 400 grit |
| 3, semi-polished | Clear reflection | 800 grit or higher |
| 4, highly polished | Mirror-like | Up to about 3,000 grit |
A light cut leaves the cream at the surface with little aggregate showing. A cut of about 1/16 inch gives a fine salt-and-pepper look, about 1/8 inch shows medium stone, and about 1/4 inch shows large stone. A light cut won’t take out old blemishes in the slab, so the condition of the concrete limits what’s possible.
Caring for a polished floor
- Dust mop often. Grit is what dulls the shine.
- Clean with a pH-neutral cleaner, not vinegar or citrus.
- Wipe up wine, juice and oil quickly. Acids can etch the surface.
- A dull path can be brought back by polishing again, without starting over.
Questions
Can any concrete floor be polished?
Most sound slabs can. Cracks, patches and old glue lines show through a polish, so we look at the slab first and tell you how it will turn out.
Polished concrete or epoxy for a garage?
Epoxy hides oil stains and tire marks under color. Polished concrete keeps the look of the slab. Many garages get epoxy, and many living spaces and studios get polish. See epoxy garage floors.
Do you test the slab first?
Yes. We test for moisture before any floor work, using ASTM moisture tests on concrete.
Sources
- La Cumbre Floor Covering & Design: services and moisture testing, October 2026
- Concrete Network, levels of polished concrete
- American Society of Concrete Contractors, Concrete Polishing Council classes and levels, Jul 2024
- Wagner Meters, how to test moisture in concrete floors