Garage Floor Coatings 101: Epoxy, Polyaspartic, and Urethane Compared
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Garage floors get hit with hot tires, oil, salt, cold, and gallons of meltwater. Coatings are how you stop those things from beating up your concrete. Three big options dominate the market.
Epoxy
The traditional garage coating. 100% solids epoxies create a thick, hard film over concrete. Pros: durable, lots of color and broadcast options (the colored flakes), broadly available. Cons: longer cure (1-3 days off the floor), more demanding surface prep, can yellow under UV at exterior thresholds.
Polyaspartic / polyurea
A newer category. Cures in hours, UV-stable, often applied in a one-day install. Pros: quick return-to-service, holds color, hot-tire-resistant. Cons: more expensive per square foot, less DIY-friendly, surface prep is still everything.
Urethane mortar
Heavy industrial product, common in food and beverage plants. Overkill for most residential garages but worth knowing about. Pros: thermal shock resistant (steam cleaning won't pop it). Cons: cost, application complexity.
The real driver: surface prep
All three coatings live or die on the prep. Concrete must be clean, profiled (think very fine sandpaper texture), and dry. Diamond grinding or shot blasting is the right prep. Acid etching is the cheaper substitute and is often inadequate. Skipping the moisture test is a recipe for delamination.
What this means for you
For a typical home garage, polyaspartic or a quality epoxy both work. The decision usually comes down to install time and price. The contractor's prep process matters more than the brand of coating they're using.
What contractors should know
Showing the homeowner the profile after grinding, alongside a coating sample, makes the prep work visible — and justifies the cost.
Before you call anyone out
If you're not sure whether the work was done right, the cheapest first step isn't a contractor callback or a paid third-party inspection — it's a documented second opinion you can refer back to.
Supervisr's Floor Coatings QA model follows industry standards and guidelines set forth by ICRI (Concrete Surface Profile / CSP guidelines), ASTM (F1869 / F2170 moisture testing), and the major resinous-flooring manufacturers. It can review floor coating photos for surface profile preparation, moisture test documentation, primer coverage, and broadcast or topcoat consistency. Upload photos of concrete surface profile (CSP grade), moisture test results, primer coverage, broadcast aggregate density, and topcoat application, and you'll get a documented evaluation back in minutes with citations to the specific standards involved. It's the same checklist a careful inspector uses — applied to your photos, on your timeline.
For homeowners, that documentation is your conversation-starter with the contractor (or, if needed, your insurer or warranty carrier). For contractors, it's the third-party verification that closes the conversation cleanly.
About Supervisr
Supervisr is an AI quality-assurance platform for floor coatings. It follows industry standards and guidelines set forth by ICRI, ASTM, and the major resinous-flooring manufacturers, and analyzes prep and application photos to predict coating performance.
Homeowners use Supervisr to verify a contractor's work without playing inspector themselves. Contractors use Supervisr to document quality at each milestone — protecting against warranty disputes and building a track record of verified work. For more on how Supervisr's QA model follows the published references for Floor Coatings installations, visit supervisrapp.com.