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Comparing Epoxy Garage Floor Coating in Northville Against a Polyaspartic System
QUESTIONS? NEED A QUOTE?
Epoxy Garage Floor Coating in Northville: The Answer
For a Detroit-metro garage, a polyurea-polyaspartic system holds up better than epoxy over the long run — it flexes with a Michigan slab through every freeze-thaw cycle and resists the oil and road salt that work into unprotected concrete, and it cures fast enough to use the garage the next day. Epoxy costs less upfront, but on one Northville job, a failing tan-and-black flake epoxy system had thinned to near nothing in places and had to be fully stripped before anything else could happen — a cost the original installation avoided but the second one had to absorb. On another Northville job, the epoxy had failed from underneath, with brown staining bleeding up through the coating from moisture and substrate contamination below. The trade-off is real: epoxy is cheaper on day one, polyurea-polyaspartic is the system built to survive what a Michigan garage puts it through.
What We Actually Found in Northville
Two Northville projects MotorCity has documented show what old epoxy can do when it fails: thinning until it disappears in places, and failing from underneath while brown staining bleeds through from below.
Richmond Drive — 904 Sq Ft, Failed Tan-and-Black Flake Epoxy, Fully Removed
At Richmond Drive, a 904-square-foot garage floor carried a tan-and-black flake epoxy system that had run its course. The flake distribution had gone uneven, thinning to near nothing in places, leaving a flat, lifeless look where the coating once had sheen. The old system had worked its way into the control joints, so removal needed to be complete, with no residue carried through. The full scope reached beyond the floor itself: 6 wooden steps and 102.8 linear feet of vertical surface running 12 feet up the walls. Our crew stripped the old coating from all 904 square feet, working systematically until bare concrete was exposed throughout, then cleaned the control joints of residue before any grinding began. With the epoxy off, the crew ran diamond grinding with an MC-4 configuration across the entire floor, preparing the 6 steps and the 102.8 linear feet of vertical surface as separate passes, since each substrate needed its own approach for proper adhesion. The crew rolled a black polyurea base coat across the floor, the vertical surfaces, and all 6 steps, broadcast Carbon flake — a black, grey, and white blend — into the wet base, and finished with a clear polyaspartic topcoat and 24-grit traction additive.
Lyonhurst Circle — 548 Sq Ft, Epoxy Failing From Underneath, Brown Staining Bleeding Through
At Lyonhurst Circle, a 548-square-foot garage floor told a more troubling story. The original tan-based epoxy with black and white flakes had visibly failed, but the brown staining spreading across multiple sections wasn’t surface contamination — it was coming from below. Moisture intrusion, adhesive breakdown, and substrate contamination had compromised the coating from underneath, and multiple cracks traversed the slab where the epoxy had lost adhesion. The scope covered 548 square feet of main floor, 22 linear feet of vertical lip, and one wood step. Our crew stripped the failed epoxy from all 548 square feet, exposing bare concrete and revealing the true depth and path of the cracks once the old coating was gone. With the slab bare, the crew worked flexible repair compound into each crack, filling and sealing every fissure, then ran diamond grinding with an MC3.8 configuration across the full 548 square feet, profiling the wood step and the vertical lip along with it. The crew applied a tan polyurea base coat across the main floor, the vertical lip, and the step, broadcast Mediterranean flake into the wet base, and finished with a clear polyaspartic topcoat and 16-grit traction additive.
Both projects point to the same underlying issue: a coating that isn’t built to move with a Michigan slab eventually fails, whether by thinning away on the surface or breaking down from underneath. Among the Northville projects MotorCity has documented, one needed a full removal after the flake wore through in places, and the other needed a full removal after moisture worked its way up from below the coating.
Epoxy or Polyurea-Polyaspartic, Side by Side
| Epoxy | Polyurea-Polyaspartic | |
|---|---|---|
| Upfront cost, installed | $4.50–$8.50/sq ft ($2,000–$3,500, 2-car garage) | $6–$12/sq ft ($2,800–$5,000, 2-car garage) |
| Cure / return-to-service time | Typically several days, longer in cold weather | Often next-day |
| Flexibility under slab movement | Rigid — can crack or telegraph existing cracks | Flexible — moves with the slab |
| UV stability | Prone to yellowing and ambering with sun exposure | Formulated to resist UV yellowing |
| Bond to properly prepped concrete | Depends heavily on prep quality | More forgiving of minor prep variance |
| Resistance to road salt | Can lose adhesion under repeated salt exposure | Built for Michigan freeze-thaw and salt exposure |
| Expected service life (SE Michigan) | 7–15 years professional; 1–3 years DIY kit | 15–20 years |
| Who can install it | Widely available, including DIY kits | Requires a trained crew — no DIY route |
For the chemistry behind these differences, see why polyurea-polyaspartic coatings outperform epoxy.
Cost
A firm price before we’ve inspected your slab would be misleading. What decides the number is the condition of what’s already on the concrete, not just the square footage. Our Richmond Drive job needed a failed tan-and-black flake epoxy system stripped from 904 square feet, plus 6 steps and 102.8 linear feet of vertical surface. Our Lyonhurst Circle job needed a failed epoxy system removed from 548 square feet, plus crack repair once the staining and cracking underneath were exposed.
What Moves the Price on a Northville Garage
- Removing a prior coating — both Richmond Drive and Lyonhurst Circle needed their failed epoxy fully stripped before anything else could happen.
- Vertical and step coverage — Richmond Drive’s 102.8 linear feet of vertical surface and 6 steps added real scope beyond the floor.
- Crack repair from hidden damage — Lyonhurst Circle’s cracks and brown staining weren’t fully visible until the old epoxy came off.
| Item | Range |
|---|---|
| Professional epoxy, installed | $4.50–$8.50 per sq ft |
| Professional epoxy, typical 2-car garage | $2,000–$3,500 |
| Polyurea/polyaspartic, installed | $6–$12 per sq ft |
| Polyurea/polyaspartic, typical 2-car garage | $2,800–$5,000 |
| Difference between the two on the same garage | roughly $1,000–$1,500 |
| DIY epoxy kit, 2-car garage | $150–$650 |
| Removing a failed coating | $2–$4 per sq ft (roughly $800–$1,800 on a 2-car garage) |
| Service life, professional epoxy (SE Michigan) | 7–15 years |
| Service life, polyurea/polyaspartic (SE Michigan) | 15–20 years |
| Service life, DIY water-based kit | 1–3 years |
A “typical 2-car garage” runs 400–500 square feet, smaller than either Northville project on this page. Epoxy is cheaper on day one, but both Richmond Drive and Lyonhurst Circle are counter-examples in MotorCity’s own records: failed epoxy systems that meant a full removal bill before anything new could go down — a cost the original installation avoided but the second one had to absorb. Day-one savings and lifetime cost are not the same comparison.
Michigan Conditions
A Northville garage floor goes through the same freeze-thaw cycling, road salt, and daily vehicle traffic as anywhere else in the Detroit metro, and the concrete our crews find reflects decades of that exposure — oil staining, surface pitting, and coatings that were never installed to handle Michigan winters. Epoxy can perform well when it’s installed correctly, but it demands precise surface preparation and has little margin for error: skip the diamond grinding, leave moisture or contamination in the substrate, or coat over a compromised slab instead of repairing it, and the coating eventually lets go, regardless of how sound the concrete underneath looks on the surface. That’s exactly what happened at Lyonhurst Circle, where brown staining worked its way up through the epoxy from problems below, and at Richmond Drive, where the flake coating simply wore thin until it no longer functioned.
FAQ
A 20×20 garage is 400 square feet, smaller than both our Richmond Drive (904 sq ft) and Lyonhurst Circle (548 sq ft) projects in Northville. Professional epoxy runs $4.50–$8.50 per square foot installed, or roughly $2,000–$3,500 total. On the Richmond Drive project, the garage needed a failed tan-and-black flake epoxy system fully stripped before any new coating could go down, which adds real cost beyond the base square-footage rate.
Prices in the Detroit metro area tend to vary from $2,000–$3,500 for a professional epoxy installation on a typical two-car garage of 400–500 square feet, and from $2,800–$5,000 for a polyurea-polyaspartic system. Those are regional ranges and do not change from one city to the next. Actual quotes are provided after a visual inspection of the concrete to be coated, because the process changes with the state of the slab. Among the Northville garages MotorCity has documented, one ran to 904 square feet plus six steps and 102.8 linear feet of vertical surface, with a thinning tan-and-black flake epoxy to remove first. Another, at 548 square feet, needed a failed tan epoxy stripped and cracks repaired after moisture compromised the coating from below. Same city, different work, different numbers.
Brown staining bleeding through an epoxy coating usually points to a problem underneath the coating, not on top of it — exactly what MotorCity’s crew found at Lyonhurst Circle in Northville, where moisture intrusion and substrate contamination had compromised the epoxy from below, with staining spreading across multiple sections and cracks traversing the slab. Once the old coating was stripped, the staining had already penetrated the concrete itself. A flexible polyurea-polyaspartic system installed over properly remediated concrete is built to prevent that kind of failure from happening again.
For an unheated Detroit-metro garage, a polyurea-polyaspartic system rates highest for durability — 15–20 years in SE Michigan conditions versus 7–15 years for professional epoxy. It’s also more forgiving of a demanding scope: at MotorCity’s Richmond Drive project in Northville, the crew coated the main floor, 102.8 linear feet of vertical surface, and 6 steps as one continuous, properly bonded system. The trade-off is cost: polyaspartic runs $6–$12 per square foot installed against $4.50–$8.50 for epoxy, and it requires a trained crew rather than a DIY kit.
See the Full Installations
Both projects are among the Northville projects MotorCity has documented. Read the full case studies, with before-and-after photos, on our Northville garage floor coating page — see the full Richmond Drive and Lyonhurst Circle installations.
Compare Coatings in Nearby Cities
The same comparison, worked through with garages documented in neighbouring cities:
- Coating a garage floor in Plymouth: epoxy or polyaspartic?
- Coating a garage floor in Livonia: epoxy or polyaspartic?
For the metro-wide picture — cost ranges, service life, and how each material handles a Michigan winter — see epoxy garage floor coating compared with polyurea-polyaspartic across Metro Detroit.
Get a Quote for Your Northville Garage
Every price on this page is a market range, not a quote. What your project costs depends on what’s actually on your slab. Call 248-613-5888 for a free inspection and an accurate number.
MotorCity Floors and Coatings
46101 Grand River Ave, Novi, MI 48374
248-613-5888 · [email protected]
