Finish · Charlotte NC

Stained Concrete

Colour that reacts with the slab rather than sitting on it

In detail

What to know about stained concrete

Two chemistries, two temperaments

Acid stain is a reactive stain. Metallic salts in an acidic solution react with free lime in the cured concrete and deposit colour inside the surface, which is why it cannot peel or flake — there is no film. The palette is narrow and earthy: rusts, tobaccos, coppers, soft greens. Water-based stains are pigment carried in a binder, so the palette is effectively unlimited including blues, greys and near-blacks, but they sit closer to the surface and behave more like a very thin translucent coat. Neither is better; they are for different jobs.

Variegation is the point, not a defect

Stain reacts with whatever is actually in the slab, so it maps the concrete's own history: where the mix was slightly richer, where a trowel pass went twice, where a patch was made. The result is mottled and no two areas are identical. That is the reason to choose stain, and it is also the thing people are surprised by if nobody warned them. If you want a uniform, repeatable colour across a large area, stain is the wrong instrument and a colour hardener or integral colour is the right one.

Why we sample on your slab

Because the reaction depends on the specific concrete, a sample panel poured elsewhere tells you very little. We test on your actual slab, in an area that will end up under furniture or out of the main sightline, and we test the sealer over it too — sealer routinely darkens stained concrete by a noticeable step and a colour approved dry and unsealed is not the colour you will live with. Approving a stain from a photograph or a showroom chip is the most common way people end up disappointed.

Existing slabs and what disqualifies them

Staining an existing patio or garage floor is often excellent value, since the slab is already there and sound. What rules it out is contamination: old sealers, curing compounds, paint, and above all oil and grease, which block the reaction and leave permanent pale ghosts. Power washing does not remove any of those. We do a water absorption test first — if water beads rather than darkening the surface, something is sealing it, and that has to come off mechanically before any stain will take.

Where it is the right answer

Stain is at its best on interior floors, covered porches, sunrooms and garage floors, where it gives depth and warmth that paint cannot approach and where it does not fight the weather. Outdoors and fully exposed it still works, but the sealer becomes a maintenance commitment rather than an occasional job, and UV will move a water-based colour over years. On an exposed patio in full southern sun we would generally steer you toward integral colour with a stamped or textured finish instead, and say so.

Commonly used for

Patios Pool Decks Outdoor Living Areas Walkways & Entries Decorative Driveways Courtyards & Surrounds

Other finishes

Six alternatives

Stamped Concrete

Texture pressed into the slab while it is still green

Exposed Aggregate

Wash the paste back and let the stone do the work

Polished Concrete

Ground, densified and refined to a mechanical shine

Decorative Overlays

A new surface bonded to a sound slab

Saw-Cut Designs

Lines cut into the slab as pattern, not just as joints

Colored Concrete

Pigment through the mix, or hardened into the surface