Choosing a garage floor coating comes down to polyaspartic vs epoxy, and the short answer is that you want both: an epoxy base with a poly topcoat, at $6 to $10 per square foot installed. Epoxy has been the default for years for its chemical resistance and durability, while poly is gaining ground for fast curing and UV stability.
Below are the real differences, what each one costs, and the downsides of both, plus why I put the two together on your floor instead of choosing one.
Quick takeaways
- Epoxy bonds hard to concrete, resists chemicals, and costs less. It yellows in sunlight and wants 55 to 90°F to cure.
- Polyaspartic holds its color under UV, goes down in colder weather, and cures in a day. It costs more and has a 45 to 60 minute working time.
- You get both on every floor we install. A HyperBond epoxy base coat under an Aspartic 85 poly topcoat, from $6 to $10 per square foot with a limited lifetime warranty.
Polyaspartic vs epoxy: what they actually are
Epoxy
Epoxy coatings are a resin and a hardener that cure into a rigid, strongly bonded film. I have been applying epoxy flooring since 2014. It suits concrete garage floors, workshops and industrial floors, anywhere the surface has to stay rigid under foot and vehicle traffic.
I recommend epoxy where chemicals are the main risk. It holds up to oil spills and battery acid, and it takes impact from dropped tools and machinery. A coating turns a dull, stained slab into a surface that wipes clean.
Polyaspartic
Polyaspartic, or poly in the field, is a type of aliphatic polyurea. It cures fast and handles temperature extremes, which is why we reach for it outdoors and on jobs where site conditions are unpredictable. Unlike epoxy, poly does not crack or peel when the weather swings from freezing to scorching, which Missouri does every year.
Poly resists scratching and keeps its gloss far longer than the epoxies I have worked with. I have seen poly floors in sun-exposed garages with no yellowing. It also gives off fewer volatile organic compounds, which matters in an enclosed garage attached to living space.
Polyaspartic also goes down fast. The coating itself is usually a single day, inside a two day window with grinding and crack repair first.
Key differences: polyaspartic vs epoxy
The comparison below covers the eight things that actually decide which coating suits a floor.
On a small phone, swipe the table sideways to see every column.
On a small phone, swipe the table sideways to see every column.
| What matters | Epoxy | Polyaspartic |
|---|---|---|
| Durability | Handles chemical spills, oil stains and heavy equipment. Best indoors, away from strong sun. | Better against hot tire pickup, cracking and scratches. Holds up through temperature swings and outdoors. |
| UV resistance | Yellows and dulls under sustained UV. | Aliphatic chemistry, so it holds gloss and color for years in sunlight. |
| Temperature and moisture | Wants 55 to 90°F to cure. Can delaminate through freeze-thaw. Poor over damp concrete. | Goes down below that range, which widens the season. Bonds better over mild moisture. |
| Install and cure | Walk on it after 24 hours, park a car after 48 to 72 hours. Hours of working time once mixed. | Coated in a single day thanks to a rapid curing chemistry, and back in service far sooner. A 45 to 60 minute working time, which is why it is professional only. |
| Slip resistance | Slick on its own. Needs silica or flake broadcast into the wet coat. | The same. Slick on its own, and textured exactly the same way. |
| Appearance | Solid colors, flake and decorative finishes. Gloss dulls as UV works on it. | The same options plus quartz and metallic, and it holds gloss and color far longer. |
| Air quality | Higher VOCs during installation. Needs ventilation. | Low VOC at 85 percent solids. The fast cure cuts exposure time. |
| Cost | The lower material cost of the two. | Higher material cost, lower lifetime maintenance. |
Every floor we install uses both coatings. The table compares two materials, not two things you buy separately.
Which one suits your garage
Epoxy is the better fit for
- Indoor garages with little direct sun
- Workshops where chemical spills are the main risk
- Indoor garages on a tighter budget
- Low to moderate traffic
Polyaspartic is the better fit for
- Sun-exposed garages and outdoor slabs
- Patios, walkways and commercial floors
- Jobs that cannot lose days to curing
- Heavy traffic and hot tire pickup
What has to happen before either coating goes down
Either coating is only as good as the slab under it. New concrete needs roughly 28 days to cure before it will take a coating at all. Your slab is diamond ground first, to cut through the laitance layer, the thin brittle skin that forms as concrete cures. Then the cracks are repaired, and the slab is checked for moisture rising from underneath.
- Grind the slab back to clean concrete.
- Fill and repair the cracks.
- Test for moisture before anything is mixed.
- Lay the HyperBond epoxy base, then broadcast the flake.
- Finish with the Aspartic 85 poly topcoat.
A coating will not fix a slab that is breaking up. If the concrete is spalling, or the cracks are moving, that is a repair job first and no topcoat hides it.
Skipping any of those three is the usual reason a floor peels a year later, and it is the same for epoxy and polyaspartic.
Cure time is separate from install time, and you walk on a floor before you park on it. A cold slab lengthens both. Our guide to epoxy floor curing and drying covers it in full.
Can you put polyaspartic over epoxy?
Yes, and it is our standard installation. No single coating performs best in every condition, so we do not make you choose between them.
We start with HyperBond, an epoxy base coat that bonds tightly to the concrete even when the surface is slightly damp. It is self-priming, and it resists moisture, impact and daily wear. On top of it goes Aspartic 85, a poly topcoat that cures quickly and protects the floor from UV, chemicals and everyday abrasion.
Blending the two gives you fast cure times and minimal downtime, a bond that holds on a damp slab, and a surface that keeps its color in sunlight. Finish options include metallic, flake, quartz and solid colors. Recent examples are Tuxedo flake in Oakville and Tidal Wave flake in Kirkwood.
What it costs
Epoxy floor installation runs $6 to $10 per square foot installed, across three packages: Good at $6, Better at $8, Best at $10.
All three include diamond grinding, crack repair, a HyperBond epoxy base coat, a full flake broadcast, an Aspartic 85 poly topcoat and a limited lifetime warranty. Better and Best add a moisture barrier, Best carries two coats of the topcoat, and the epoxy flooring page has the full breakdown.
What this looks like on real floors
Three of these are worth reading in full, because each one tests a different claim made above.
- A full polyaspartic floor. 550 sq ft in Kirkwood, finished inside a two day window using a Tidal Wave flake blend. See the Heubbe garage in Kirkwood.
- The combination, indoors and outdoors. A Fenton garage and a new screened-in patio, both diamond ground and crack repaired, then coated in epoxy flake under a poly topcoat. The patio is the part that matters, because sun exposure is where a topcoat earns its place. See the Esselman garage in Fenton, finished in April 2026.
- Commercial, coated over existing tile. Blueberry Hill on the Delmar Loop needed bathroom floors that survive constant foot traffic. What we found there was that the tile had to be ground right back before anything would bond to it, so that is what we did, then finished with an aliphatic protective topcoat. See Blueberry Hill in University City, finished in February 2026.
Watch a floor go in. This is an install in St. Louis, start to finish. The full clip sits on its watch page.
| Job | Where | System as recorded | Scope | On site |
|---|---|---|---|---|
| Heubbe | Kirkwood, West Adams | Polyaspartic flake, Tidal Wave | 550 sq ft garage | 2 days |
| Esselman | Fenton, Summer Top Circle | Epoxy flake, poly topcoat | Garage and screened-in patio | 2 days |
| Blueberry Hill | University City, Delmar Loop | Commercial epoxy flake, aliphatic topcoat | Restaurant entry and bathrooms | 2 days |
| Reiff | Clayton, Colonial Ct | Epoxy, concrete repaired first | 200 sq ft, pre-listing | 1 day |
| Reich | Ballwin, Winchester | Epoxy flake, extra traction media | Garage used as a home gym | 2 days |
| Masksumic | Oakville, Birchmont Place | Epoxy flake, Tuxedo | Grind and crack repair, 22 December | 2 days |
| Skurtu | Des Peres, White Stable Road | Non-slip epoxy flake | After drywall and window reframing | 2 days |
| Hanson | Lake St. Louis, Forest Crest | Epoxy flake | Finished ahead of an overseas move | 2 days |
| Sult | Fenton, Winter Valley | Epoxy flake | Completed 23 December | 2 days |
| Lieberman | Ladue, Ladue Estates Drive | Epoxy flake | Completed before move-in | 2 days |
| Albers | Weldon Spring, Lancelot Drive | Epoxy flake with crushed stone | Recoat over an existing epoxy floor | 2 days |
| Randall | Ladue, Creekwood Ln | Epoxy with slatwall | 400 sq ft remodel | 5 days |
| Leitner | Fenton, Tapawingo | Epoxy with cabinets and overhead storage | Full garage remodel | 4 days |
“Excellent service and work! We are very happy with the quality of work and final project. From the initial bid to final wrap up, Brandon and his crew have been great to work with.”
Polyaspartic vs epoxy: common questions
Not sure which system your floor needs?
We measure your slab, check it for moisture, and quote one of the three packages. The visit costs you nothing.
or call 314-308-7780
Final thoughts
Both coatings have their place, so you are not asked to choose. Epoxy is still a solid option for a budget indoor floor. A poly topcoat resists fading and hot tire pickup better, and that is what matters in a St. Louis garage that swings from freezing to humid.
You will not need every coating on the market. If the garage is dry, shaded and you park one car in it, epoxy alone will serve you, and I would say so rather than sell you a topcoat you do not need.
Garage Designs of St. Louis has been remodeling garages since 2002 and works out of 772 Merus Ct., Fenton, MO 63026, accredited by the Better Business Bureau, or BBB, since 2008. I am Brandon Coleman. I have installed epoxy floors across the metro since 2014 and bought the company in 2023. We cover the St. Louis metro, including Kirkwood, Clayton, Ladue, Ballwin, Oakville and Des Peres.
Request a free estimate, or call 314-308-7780 Monday through Friday, 8 AM to 5 PM.
