Garage Floor Coatings 101: Epoxy, Polyaspartic, and Urethane Compared
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.
The part nobody can see later
Most of what decides how this holds up gets covered before the job is over. Once it is closed in, the only record of how it went in is the photos taken while it was still open.
Supervisr's Floor Coatings QA model works from common industry practice and the installation instructions that ship with the materials. 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.
For a homeowner, that record is a straightforward way to understand what you paid for. For a contractor, it is the milestone documentation that stands behind a workmanship warranty years later, long after the crew has moved on to the next job.
About Supervisr
Supervisr is an AI quality-assurance platform for floor coatings. It works from common industry practice and manufacturer installation instructions, and analyzes prep and application photos to predict coating performance.
Contractors use Supervisr to document quality at each milestone — backing up a workmanship warranty and building a track record of work they can point to. Homeowners end up with a clear record of what went into their home. See how it works at supervisrapp.com.