Redlands Epoxy Floors has been installing epoxy garage floor systems across Redlands, CA for more than twenty years, serving surrounding cities including Mentone, Highland, Loma Linda, Yucaipa and Calimesa. A garage slab is the most parked-on, most walked-on concrete most people own, and it is also the slab poured with the least care in the whole house.
The question we field more than any other is whether a kit from the home center does the same job. It does not: a kit contains resin, flake and an etching solution, but no grinder, no moisture probe, and nothing like the solids content needed to build a film that survives a hot tire.
So most of this page is about those three missing things: opening the concrete mechanically, measuring what the slab is doing with water, and specifying a system thick enough to justify emptying your garage for it. The color decisions come afterward, because they are the easy part.
What Comes in the Box, and What Cannot
Etching Is Not Profiling
Acid or citric etch dissolves cement paste and leaves a slab with a softened, weakened skin and no measurable texture, so a coating placed over it bonds to a layer that was already compromised. Diamond grinding cuts that layer away entirely and leaves an ICRI concrete surface profile we can name, commonly around CSP 3 for a thin-film garage system, on a scale that runs from CSP 1 through CSP 10.
The pairing that decides whether the grind works is grit sequence against diamond segment bond hardness, and it runs backward from intuition. Hard, dense concrete needs a soft bond so the segments wear away and keep exposing fresh diamond. A hard bond on a hard slab burnishes the floor smooth instead of cutting it, which looks like immaculate preparation and leaves no key at all.
Nothing in a Kit Measures Moisture
Housing stock poured before the 1960s generally went down without an under-slab vapor retarder, so a garage slab in this valley is often in direct contact with soil that stays damp. Water moving up through that slab is indifferent to what is on top of it, and it is the failure that nearly every coating warranty in this trade specifically excludes.
We measure it one of two ways. Calcium chloride to ASTM F1869 reads the rate of vapor coming off the surface; in-situ relative humidity probes drilled into the slab to ASTM F2170 read the state of the concrete internally. Both threshold numbers live in ASTM F710 rather than in the test methods themselves, which is precisely where citations drift.
The plastic-sheet test, ASTM D4263, is worth naming because it gets recommended constantly online. It is asymmetric. Condensation under the taped sheet fails a slab outright. A dry sheet proves nothing at all, since the method was never sensitive enough to give a slab a pass.
Solids Content Is Where the Thickness Goes
Solids content is the fraction of what you pour that is still on the floor once the carrier has left. A 100% solids epoxy cures at roughly the thickness it was placed at, while a thinned or water-based product loses much of its film as it dries, so a coat that looked generous going down finishes as a skin. That is the mechanism behind hot tire pickup: a warm tire softens a thin film and lifts it off the slab.
We state mil build in the proposal as a number with the product data sheet attached, and we check it wet with a wet film thickness gauge as the material goes down. A floor nobody can measure is a floor nobody can be held to.
What Actually Moves the Price
Square Footage Is the Smallest Variable
Two-car garages are close enough in size that footage rarely separates two honest quotes. What separates them is preparation and system: how much grinding the slab needs, whether an old coating has to come off first, whether the moisture reading forces a vapor barrier primer, and how many coats the specification calls for.
The Slab Decides Half of It
Chasing and filling cracks, rebuilding a spalled edge at the door line, repairing a trench cut for a sub-panel, drawing decades of oil out of the concrete. Each of those is real labor before a single pail is opened, so we write the repair scope as its own section of the proposal.
The System Is the Rest
A single thin coat over bare concrete and a primer plus broadcast plus two topcoats are both sold as an epoxy garage floor, and they are not comparable products. Ask any two quotes for the mil build, the number of coats and the product names, and the difference in price usually explains itself.
Choosing the System for Your Bay
100% Solids Epoxy as the Body of the Floor
Epoxy is what builds thickness and grips prepared concrete, so on most garages it works as the base and the flake-locking coat rather than as the finish. It is also where a moisture vapor barrier primer belongs when the reading calls for one, because those products are formulated to wet into a slab and block vapor rather than to look good on top.
Polyaspartic and Polyurea on Top
An aliphatic polyaspartic is the reason a one-day garage is possible at all, because its recoat windows are counted in hours instead of running overnight. It also holds color under UV where an epoxy ambers, and it will cure at temperatures that stall an epoxy outright, which matters far more for an unheated garage up in the foothills. Polyurea behaves similarly.
Texture Is Something You Live With Daily
Vinyl flake broadcast to rejection gives real grip underfoot and enough visual noise to hide tire marks and patched areas. A light scatter reads calmer and cleans more easily but shows more of what happens to it. Quartz broadcast is coarser and harder again, the right call where a garage doubles as a wash area or a workshop with a floor drain. Every increase in grip is an increase in what a mop has to work against.
Our Step-by-Step Epoxy Garage Floor Process
1. Read the Floor and Write It Down
We take the moisture reading, sound the slab for hollow areas, look at the joints and cracks, and note the door line, any drains and anything anchored into the concrete. All of it goes into the proposal alongside the system, the mil build and the two dates that matter: when the bay has to be empty and when you can use it again.
2. Empty the Bay Completely
The slab has to be bare, which means shelving, the second refrigerator, the workbench and anything bolted down. We identify fixed items while quoting, because a floor coated around an obstacle carries a visible seam where the obstacle used to be.
3. Open the Concrete
Diamond grinding across the field, hand tooling into corners and along the wall line, and PCD tooling first where an old coating has to be sheared off. Dust is captured at the tool rather than into the house. The floor is then vacuumed and inspected, because grinding reveals the cracks nobody could see through the dirt.
4. Repair, Then Prime to the Reading
Static cracks are filled with a semi-rigid joint filler and ground flush so the repair carries a wheel instead of reopening. Moving joints are honored through the system rather than bridged. Primer goes down after the repairs, and which primer it is comes from the moisture number rather than from habit.
5. Build, Broadcast and Topcoat
The base coat is pulled out with a notched squeegee or a gauge rake, back-rolled, and flake is broadcast into it while it is still wet. Once it has cured, the loose flake is scraped and vacuumed off and the topcoat goes on with an air-release roller. Batch sizes are matched to slab temperature, because pot life is a curve rather than a number: roughly sixty minutes at 55 degrees, and about twenty at 95.
The First Year and the Tenth
Cleaning Without Wearing the Gloss Off
A cured resin floor wants warm water, a soft brush and a neutral cleaner. What dulls it is abrasive grit ground underfoot and harsh solvents used habitually, not the traffic itself. Sand and decomposed granite tracked in at the door line does more to a garage floor than everything parked on it, which makes a mat at the threshold the cheapest maintenance available.
Hot Tires, Jack Stands and What Actually Marks It
At full mil build over a properly profiled slab, a hot tire will not lift the coating. Point loads are a different matter, because a jack stand on a bare foot, a floor jack wheeled across on a hot afternoon or a dropped breaker bar concentrates load in a way no resinous floor is immune to. A scrap of plywood under a jack stand prevents most of it.
When a Topcoat Refresh Beats a Rebuild
The layer that wears is the topcoat, not the whole system. A floor whose base is sound and well bonded can be abraded and recoated for a fraction of what the original install cost. We test pull-off adhesion to ASTM D7234 before recommending it, because a recoat over a system that is already letting go inherits the failure it is covering.
When We Say Do Not Coat It
Some slabs are not candidates. Concrete saturated with oil that keeps migrating upward, a floor already ground thin by a previous removal, structural cracking that is still moving, or a moisture reading high enough that mitigation costs more than the floor is worth. In those cases we put it in writing and you decide what to do with the money. That answer has cost us jobs and never once a callback.
- 20+ Years on Inland Empire Concrete
- Every Slab Moisture Tested
- Free Written Proposals