Garage coatings in San Antonio last when they're bonded to clean, mechanically prepared concrete after crack repair and a moisture check. Summer heat shortens working time, so installers adjust scheduling. Cracks that move with the clay will often show through, and a slab that has dropped or pulled away from the house should be evaluated first.
Last updated
In San Antonio the garage is often a workshop, gym, storage room and laundry space as well as a place to park. A coated floor is easier to clean and brightens the room. How long it lasts depends mostly on surface preparation and on what the slab underneath is doing.
Coating types
- Epoxy: a two-part resin that bonds to prepared concrete, often with decorative flakes and a clear topcoat.
- Polyaspartic and polyurea: fast-curing coatings used as topcoats or full systems, generally more resistant to UV yellowing than many epoxies. That helps in garages where the door is often open to bright sun.
- Penetrating sealers: low cost, repel water and stains, and don't change the look much.
- Polished concrete: ground and densified concrete with no coating.
Preparation is the job
Coatings fail most often because they weren't bonded to clean, sound concrete. Proper prep usually means mechanical grinding or shot-blasting, removing oil and old sealers, and repairing cracks and spalls. Thin roll-on kits over an etched slab are more likely to peel, especially where hot tires sit.
Heat and installation
Garages here can get very hot in summer, and coatings cure faster as temperature rises. That shortens working time and can cause bubbles or uneven texture if the installer isn't ready for it. Many installers schedule summer jobs early in the day and watch slab temperature, not just air temperature. Ask how they adjust.
Moisture from below
Moisture moving up through a slab can push a coating off. Older homes may not have a vapor retarder under the garage slab, and clay soil that stays damp under the slab adds to the risk. A good installer tests before coating and chooses a system for the result.
Cracks and movement
On expansive clay, garage slabs often have cracks that open and close with the seasons. Hairline cracks can be filled before coating, but a crack that moves will usually show through again. Ask how the installer treats active cracks, and whether a flexible joint is better than a rigid fill. If the slab near the door has dropped or the garage floor has pulled away from the house, have it evaluated before coating; that can be a foundation question.
Replacing the slab
If the floor is beyond repair, replacement means breaking out the slab, correcting the base and pouring new concrete with joints, slope toward the door and, ideally, a vapor retarder. Because a garage slab may tie into the house foundation, ask whether a permit and a registered residential building contractor are needed in your city.
Living with it
- Follow the installer's cure time before parking.
- Glossy finishes can be slippery when wet. Ask about anti-slip additives.
- Clean up spills promptly.
Questions to ask
- How will you prepare the surface, and do you test for moisture?
- Which products and how many coats, and how thick is the system?
- How do you handle cracks that move with the seasons?
- What does the warranty cover, such as peeling or hot-tire pickup?
Ready for a new floor? Request a garage floor contractor and include a photo of the current slab.
See how it works
Frequently asked questions
Why do garage coatings peel?
Usually poor surface prep, moisture coming up through the slab, or hot tires softening a thin coating. Grinding, a moisture test and a system rated for vehicles reduce the risk.
Is polyaspartic better in a sunny San Antonio garage?
Polyaspartic is generally more UV-stable than many epoxies, which helps when the door is often open to sun. Many systems combine an epoxy base with a polyaspartic topcoat.
Can I coat a floor with seasonal cracks?
You can, but cracks that open and close with clay movement often reappear. Ask the installer how they treat active cracks, sometimes as flexible joints instead of rigid fills.
Sources and further reading
- City of San Antonio Development Services: No Permit Required list
- City of San Antonio Development Services: Residential permits
- City of San Antonio: Sidewalk-Curb permit application
- City of San Antonio: Building and home improvement contractor registration
- City of San Antonio: Sidewalk, curb and gutter contractor license
- Bexar County Public Works: Right-of-way permits
- City of Alamo Heights
- San Antonio Water System (SAWS)
- TCEQ Edwards Aquifer Protection Program
- Texas Water Development Board: Houston Black, the Texas state soil
- USDA NRCS Web Soil Survey
- Texas 811
- Texas A&M Forest Service: Texas Oak Wilt
- American Concrete Institute (ACI)
- Portland Cement Association (PCA)