Residential Epoxy Garage Floors in Spearfish, SD

1. How the concrete is prepped

Epoxy bonds mechanically. It needs a rough, open surface to grip, something like fine sandpaper. The coatings industry measures this with the ICRI Concrete Surface Profile (CSP) scale, and floor coatings like ours call for a light-to-medium profile.

The only reliable way to get there on a garage slab is diamond grinding. Acid etching, the method most kits use, is inconsistent and leaves residue behind if it isn’t neutralized and rinsed perfectly. Pressure washing alone doesn’t open the surface at all.

We grind every floor with Niagara Machine prep equipment and vacuum the dust as we go. Grinding also takes off sealers, old paint, curing compounds and the weak top layer of the slab, all of which a coating would otherwise sit on top of instead of bonding to.

Ask: “Do you grind the floor, or etch it?”

2. Whether anyone checks for moisture

Concrete is porous, and moisture moves up through it from the ground. If too much vapor pushes up under a coating, it can lift it off the slab and show up as bubbles, blisters or peeling patches months later.

This matters most in new homes, where the slab is still drying out, and in garages without a vapor barrier under the concrete. There are standard ways to check, from a taped-down plastic sheet test to in-slab relative humidity probes. If the readings are high, the right move is to wait or use a moisture-mitigating primer, not to coat and hope.

Ask: “How do you check for moisture before you coat?”

3. How cracks and joints are handled

Almost every garage slab has cracks, and most have saw-cut control joints. Cracks get cleaned out, filled with a repair material and ground flush so they don’t telegraph through the finish. Control joints can be filled for a smooth, easy-to-clean floor, or left open, depending on the slab and what you want. We’ll walk you through the tradeoff on site.

A coating won’t stop a slab that’s still moving from cracking again. What it will do is keep water and salt out of the cracks you have, which is a big part of what makes concrete break down.

Ask: “What will you do with these cracks?”

4. The quality of the base coat

The base coat does the bonding. Thin, watered-down epoxies don’t penetrate or build enough film to hold up to vehicle traffic. We use Sherwin-Williams TileClad, a commercial-grade epoxy, applied at the thickness the manufacturer specifies.

5. Full flake coverage

For a garage, we broadcast flake “to refusal,” meaning we keep throwing chips until the wet base coat can’t take any more. A full broadcast hides minor slab flaws, gives the floor texture for wet boots and adds body to the system. Then the loose flake is scraped and swept off before the topcoat goes on.

6. The topcoat

The topcoat takes the daily wear: tire traffic, dropped tools, chemicals, UV light through an open door. Epoxy alone is hard but can scratch and amber in sunlight over time. A polyurethane topcoat like ArmorSeal Rexthane 1 adds the scratch, chemical and color resistance a garage floor needs.

Ask: “What’s the topcoat, and how many coats go down?”

7. Whether the cure is rushed

This is the one that gets skipped most often. Some contractors sell a one-day garage floor. That sometimes means starting before sunrise and topcoating late at night, before the base coat has fully cured, because the crew needs to be at the next job tomorrow.

We let the base coat cure overnight, undisturbed, and apply the topcoat the next day. It means your garage is out of use a little longer, but each layer bonds the way the manufacturer designed it to. For a floor you want to last a decade or more, we think one extra day is the right trade.