Side by side
| Epoxy | Polyaspartic / polyurea | |
|---|---|---|
| Bond to concrete | Strong, penetrates well | Strong on properly ground concrete |
| Sunlight (UV) | Yellows over time | UV stable, stays clear |
| Cure speed | Slow: often a day or more per coat | Fast: recoat in hours |
| Before you park | Up to about a week | About 24–48 hours |
| Cold-weather install | Slows a lot in the cold | Cures at lower temperatures |
| Flexibility | Hard and more brittle | Tougher, more flexible |
| Hot-tire pickup | A risk with thin coats | Better resistance |
| Installed cost (national) | About $4–10 per sq ft | About $5–12 per sq ft |
| Expected life in a home garage | Varies widely with the product and thickness | 10–20+ years when professionally installed |
Why most pro systems combine them
Each chemistry does something best. A base coat that wets out and bonds into ground concrete, a broadcast of flake, and a polyaspartic topcoat that stays clear, tough and UV stable gives you the strengths of each. Single-product systems exist too; what matters most is surface prep and film thickness.
What about DIY epoxy kits?
Kits use a thin, water-based epoxy over acid-etched concrete. Etching doesn't open the surface the way diamond grinding does, the film is thin, and hot tires can lift it. They can look good for a while, but they're the reason so many people think coatings peel. More on that in why garage floor coatings peel.