Epoxy vs Polyaspartic: Which Should You Choose?

I get asked this question about once a week. And the honest answer is: it depends. But I'll explain exactly what it depends on, because "it depends" on its own doesn't help anyone.

The Two Products, Briefly

Epoxy is a two-component resin — a resin and a hardener mixed together before application. It's been the industry standard for decades. Polyaspartic is a newer formulation, based on polyurea. It's chemically different, but applied in a similar way.

The big practical difference: polyaspartic cures much faster (6 to 24 hours, versus 72 hours for epoxy), and it resists UV much better, meaning it won't yellow in sunlight.

When Epoxy Is the Right Choice

For a standard residential interior garage — which represents the vast majority of projects we do on the South Shore — standard epoxy is excellent. It costs less to install, it's available in a wide variety of colors and effects (flakes, metallic), and it lasts 15 to 20 years if the prep work was done properly.

The fact that it yellows slightly over time isn't really a problem in an interior garage, because there's no direct sunlight. (Or at least, not enough for it to become noticeable for a long time.)

When Polyaspartic Is the Better Choice

As soon as we're talking about exterior surfaces — concrete stairs, balconies, patios, exterior garage aprons — polyaspartic is clearly superior. Its UV resistance is much better, and its flexibility allows it to better absorb the concrete movement caused by freeze-thaw cycles.

It's also worth considering when the timeline is tight. If you need your garage back quickly, the shorter cure time makes a real difference.

What It Costs More

Polyaspartic generally runs 20 to 40% more expensive to install. Not because the product itself is dramatically more expensive, but because the application window is shorter and demands more experience from the applicator. A product you can't afford to redo demands more care.

My default recommendation: epoxy for interiors, polyaspartic for exteriors. If you have a comfortable budget and want the best available product regardless of cost, polyaspartic throughout is a valid option. But for most residential garages on the South Shore, standard epoxy does the job very well.