Epoxy vs. polyaspartic: which is right for a San Antonio garage?
Both seal and protect your slab, but they behave very differently — especially under long hot summers, humidity, and expansive clay soils that move slabs. Here’s how they compare on the things that matter for a San Antonio garage.
Cure, UV, durability, and cost
- Cure time: epoxy takes 12–16+ hours per coat and days to fully harden; polyaspartic cures in about an hour and is usually walk-on the same day.
- UV stability: polyaspartic is UV-stable and won’t yellow; standard epoxy can amber over time in sunlight.
- Durability & lifespan: epoxy typically lasts 5–10 years; a polyaspartic-grade system commonly lasts 15–20+ years and flexes over slab movement instead of cracking.
- Cost: epoxy runs a few dollars less per square foot up front; polyaspartic costs more initially but usually wins on cost-per-year. See typical San Antonio ranges on our pricing page.
The San Antonio verdict
San Antonio sits on expansive South Texas clay that swells and shrinks with the seasons, quietly opening hairline cracks in slabs across the area. Add long, humid summers and the occasional hard freeze, and a floor coating has to flex with the ground rather than sit rigid on top — or it telegraphs every crack the soil underneath creates. Many area slabs are newer suburban pours on clay-heavy lots, where movement is normal and crack repair during prep is the difference between a finish that lasts and one that splits within a year.
For most San Antonio garages, a polyaspartic-grade system is the better long-term call — it stands up to long hot summers, humidity, and expansive clay soils that move slabs where a basic epoxy kit gives out. We still spec epoxy where it’s the right fit and budget; the point is matching the system to your slab and how you use it, not selling one answer.
Talk to a San Antonio floor crew — free.
Questions about your slab, timing, or budget? We’ll walk it with you and put a fixed price in writing.