There is no universal winner. The right system depends on your slab's condition and moisture, how fast you need the garage back, UV exposure, your budget and the look you want. A well-prepared slab matters more than the label on the can — ask every contractor what preparation and moisture testing they include.
| Factor | Epoxy | Polyaspartic / polyurea |
|---|---|---|
| System base | Two-part resin coating, often built in multiple coats with an optional topcoat. | Fast-curing coating chemistry, often used as a full system or as the topcoat over an epoxy base. |
| Typical return to use | Slower — commonly several days before vehicles, depending on the product and conditions. | Often faster — some systems allow vehicles back sooner. Exact times vary by manufacturer and are confirmed by the contractor. |
| Flexibility | Harder and more rigid once cured. | Generally more flexible, which can help with minor slab movement and temperature swings. |
| UV reaction | Can yellow or amber over time with sun exposure unless protected by a UV-stable topcoat. | Typically more UV-stable and less prone to yellowing. |
| Appearance | Widest range of colours, decorative flake and metallic effects. | Clear, consistent finishes; commonly paired with flake systems. |
| Planning price range | About $5–$9 per sq. ft. (standard epoxy); decorative flake about $6–$10; metallic about $8–$12. | About $5–$12 per sq. ft., depending on the system and preparation. |
| Typical scenarios | Budget-conscious projects, maximum finish choice, garages that can stay empty longer. | Tight timelines, strong sun exposure, freeze-thaw stress, or when a faster return matters. |
Product performance and installation requirements vary by manufacturer and contractor. Ranges are Calgary planning ranges, not quotes.
Winter grit and de-icing chemicals are tracked in daily. Both systems resist them when properly installed; anti-slip texture and regular cleaning help either way.
Studs chew at any coating. Ask contractors how their system handles stud wear and what the repair path looks like.
Rapid temperature swings stress the slab-coating bond. Flexibility and correct preparation for the slab's condition matter more here than brand names.
South- and west-facing garage doors let in serious UV. If the door is open often, UV stability (or a UV-stable topcoat) deserves weight in the decision.
Whichever system you choose, the result depends on the slab: mechanical surface preparation, crack and pitting repair, and — critically — moisture testing. Concrete that holds too much moisture can push any coating off. A contractor who skips moisture testing to win the job is a risk regardless of which system they sell. Compare written quotes on preparation, testing, coats and warranty, not just the total.
Describe your garage once and compare what independent contractors recommend for your slab — system, preparation and written price.