Short answer: Both can work in an Ontario garage. Epoxy is the established, lower-cost base coat. Polyaspartic cures much faster and resists UV yellowing, so it is often used as a topcoat over epoxy or as a full system where speed or sunlight matter. In both cases, the preparation of the concrete decides how long the floor lasts more than the product name does.
The key differences
| Epoxy | Polyaspartic | |
|---|---|---|
| UV exposure | Discolours with prolonged UV exposure unless topcoated | Generally UV-stable; less prone to yellowing |
| Cure speed | Slower; return to service often takes days | Much faster; same-day or next-day use is common |
| Working time | Longer, more forgiving to apply | Short; can gel in under 30 minutes in warm conditions |
| Cold-weather install | Cure slows sharply as temperatures drop | Designed to keep curing at lower temperatures |
| Cost | Usually lower | Usually higher |
Manufacturer data sheets give the exact limits for each product, and they differ between brands. Euclid Chemical, for example, states plainly that "epoxy coatings will discolor upon prolonged exposure to ultraviolet light" and recommends a UV-stable urethane topcoat where floors get sun.
What Ontario winters actually change
Road salt and meltwater. Cars bring salty slush into GTA garages for months. Any coating needs a sound bond to the concrete so water cannot get underneath. That comes from preparation: Euclid's instructions call for a concrete surface profile of CSP 2 to 5, achieved mechanically where possible.
Cold slabs. Epoxy cures slowly in the cold, and installers must also keep the surface at least 3°C (5°F) above the dew point to avoid condensation under the coating. Polyaspartic tolerates lower temperatures better, but the slab still has to be dry and within the product's stated range. A heated or attached garage is easier to coat in winter than a cold detached one.
Hot tire pickup. Warm tires on a soft or poorly bonded coating can lift it. Allowing the full cure time before parking matters with either product.
Which one should you choose?
- Choose an epoxy base with a UV-stable topcoat if you want a thick, durable build at a moderate cost and can stay off the floor for a few days.
- Choose a polyaspartic system if the garage gets direct sunlight, you need the space back quickly, or you are installing in cooler months.
- Either way, ask what is under the coating: preparation, repairs and moisture testing.
Questions to ask an installer
- Which products are you using for each coat, and can I see the data sheets?
- What temperature range does each product need, and how will you check the slab?
- How long before I can walk on it, and before I can park?
- How will you prepare the concrete?
Not sure which coating suits your garage? We will look at your concrete and how you use the space, then give you a written estimate for the system we recommend. We install epoxy floors across the GTA, including Vaughan.
REQUEST A FREE ESTIMATERelated: what epoxy garage floors cost and why epoxy floors peel.
Sources: Euclid Chemical: EUCOPOXY TUFCOAT installation instructions (PDF) · Green Building Canada: Polyaspartic vs. epoxy for one-day garage floors