Aurora Stained Concrete

Watch the rinse water. That's the honest tell on a stain job, and it's the part nobody photographs. When the acid has finished working and we start flushing the floor, the first water off it runs cloudy and rust colored with spent reaction product. Then it runs pale. Then it runs clear. A crew that quits at pale leaves residue sitting in the pores, and residue is what shows up as a chalky bloom under the sealer three weeks later.

So here's the whole day, front to back, on an Aurora stain job. We color patios, entry landings, basement floors, and garage slabs from Sterling Hills out to Southshore, and the sequence never really changes. What changes is how long each step takes, because a slab that has been sitting in the sun for two decades behaves nothing like one poured last fall.

Morning: strip it, test it, mask it

Nothing starts until the slab is genuinely bare. We degrease, then grind wherever old sealer, paint, carpet mastic, or a previous owner's garage epoxy is still clinging on. Then the water test: a few drops in a dozen spots across the floor. If any of them bead instead of darkening, that area is still sealed and the acid will skate right over it. That's the leading cause of a blotchy floor, and it's entirely preventable inside the first hour.

Then the test patch, always in a corner behind a door or under where the grill parks. Concrete decides the final tone as much as the product does, so a color chart is a starting point and nothing more. Once you've stood over the real color on your own slab, we mask everything a sprayer can reach: siding, posts, thresholds, stone veneer, the bottom rail of a fence, and the plantings along the edge. Drop cloths go past the drip line, not up to it.

Where a stain day goes sideways

What Aurora concrete does to color, and when we schedule it

Two slabs, same bottle, different floors. Older exterior concrete that has weathered for years carries an open surface, so the acid gets down in and the mottling comes out with real range. Newer flatwork in Southshore and around the Saddle Rock builds runs tight and hard troweled, and it takes color light and even. Neither one is wrong. We'd just rather tell you which you own before you pick a tone, and on a dense new slab we usually reach for dye to get depth the acid can't produce on its own.

Then the sun. At 5,471 feet the ultraviolet load is heavier than people budget for, and the sealer is what pays it. Mineral color living inside the concrete doesn't wash out in any meaningful way. The coating above it goes thin, then dull, and once it's gone the surface starts absorbing everything that lands on it. Keep to a two or three year refresh and that never becomes a story. A south-facing patio in Tollgate Crossing with nothing shading it wants the short end of that range.

Season is simple. Exterior color runs mid-May into early October, and the shoulders beat the middle. A July cell can land on your patio an hour after we neutralize, and rain in the rinse window is how good work goes patchy. Interior floors run all twelve months.

Living with a stained slab

• Dust mop or soft broom often. Tracked grit does more damage than anything in a bottle
• pH neutral cleaner only. Vinegar, citrus, and bleach strip the sealer and then start on the color
• Wipe grill grease and planter runoff before they sit through a whole season
• Felt pads under indoor furniture, glides on outdoor chairs, mats at every door
• Sand for winter traction on exterior color. No chloride ice melt, not the first winter, not the tenth
• Every spring, splash a cup of water on it. Soaks in dark means it's time for a refresh coat
• Call before you pressure wash. Wrong tip at the wrong distance takes the sheen right off