What questions should I ask a garage floor coating installer in San Antonio TX before signing?

A San Antonio TX garage floor sits in a geological zone most installers nationally have never had to read. The western and northern reaches of Bexar County sit over Edwards Plateau karst with thin soil cover over fractured limestone, while the south and east lean into heavier clay influence as you move toward the coastal plain. The military-base footprint at JBSA (Lackland, Randolph, Fort Sam Houston, Brooks) brings a constant flow of frequent-mover households who scrutinize warranty paperwork the way a base housing office scrutinizes a sign-out checklist. The installer you hire needs to know all of that before they quote a system. The ten questions below separate a verified San Antonio crew from a sales rep.

Why the bid conversation matters more in Bexar County

A 1925 slab in King William Historic District is a fundamentally different scope than a 2020 production-home garage in Alamo Ranch off Loop 1604. The King William slab has nearly a century of Texas heat cycles worked into the surface, likely a prior sealer or two, and an unknown moisture history. The Alamo Ranch slab is newer concrete on thin limestone soils with very different prep needs. A serious installer reads the actual slab before quoting. Find your San Antonio TX crew through the local hub, and use the questions below at the assessment.

The ten questions, in the order they should come up

1. What diamond grind grit and how many passes on this specific slab? The answer should reference a CSP (Concrete Surface Profile) target and explain that grit selection depends on what is on the slab now. A bad answer is "we acid-etch" or any version of skipping mechanical preparation. Acid etching on a UV-degraded South Texas slab gives you bond to weak laitance, which lifts off within a season.
2. Are you doing a moisture test before product selection? Slabs in the Medical Center District and parts of Tobin Hill and Southtown were poured before vapor barriers were standard, and lots near the San Antonio River corridor have variable groundwater dynamics. Moisture vapor pushing up through a slab is the most common first-year failure mode. A real installer brings a calcium chloride test or a relative humidity probe. A bad answer is "we have never had a problem with that here."
3. What basecoat chemistry, and is it matched to this slab and this climate? The standard for San Antonio residential should be a high-solids two-part epoxy. The installer should be able to name the manufacturer and the specific product, not say "industrial epoxy" or "professional formula." A bad answer dodges the chemistry name entirely.
4. Is the topcoat aliphatic polyaspartic, and is it UV-stable? South Texas UV intensity is among the most extreme in the country, and a west-facing garage door in Stone Oak or out toward Helotes takes direct sun every summer afternoon. The right answer is aliphatic polyaspartic with manufacturer-published UV-stability data. The wrong answer is "epoxy clear coat" or no topcoat at all.
5. Is this a single-day install for a standard two-car bay? A properly specified polyaspartic system supports same-day installation when the prep is real. A bad answer is a multi-day install for a standard residential job, which usually means the topcoat is slow-cure epoxy rather than actual polyaspartic. The mechanics are in polyaspartic garage floor install time.
6. What is the cure schedule before walk-on and vehicle traffic? The honest number on a properly installed polyaspartic system is walk-on the next day and vehicle traffic in roughly three days. A bad answer is a week or more for a standard residential job, which points to wrong topcoat chemistry.
7. What are the specific terms of the warranty? The right number is a Limited 15 Year Warranty that covers adhesion failure, peeling, and delamination under normal residential use. The warranty also has to be documented in writing and transferable if you sell the home, which matters intensely to military households in the JBSA corridor who may PCS within three years. A bad answer is "lifetime warranty" with no documented terms, which is a marketing claim, not a coverage claim. Our note on polyaspartic garage floor lifespan covers how the 15 year number maps to real performance.
8. How are you handling cracks and spalling on this slab? A real installer walks the floor and points to specific cracks before quoting. Structural cracks get epoxy or polyurea injection. Hairline shrinkage cracks get evaluated honestly. A bad answer is "we coat over it," which is how a young floor fails. The deeper failure modes are covered in why epoxy garage floors peel.
9. Is the person walking my slab today actually installing the coating? In San Antonio, where the same verified crew handles assessments and installs, the answer should be yes or "I work with the install lead daily and you will meet them on day one." A bad answer is a polished sales rep who hands you off to "the install team" you never see again.
10. Are you insured, and is the crew verified through the Amazing Garage Floors network? Verified means the crew has been trained on the specific product system, audited on installation quality, and stands behind the same warranty across the national footprint. A bad answer is vague insurance language with no documentation, or a company name that does not appear in any installer directory.

What the right answers sound like together

A good San Antonio installer connects the answers. They will tell you that your Monte Vista slab is older concrete with a UV-degraded surface that needs deeper grinding than newer construction, that any cracks at the door threshold need to be cut out and patched before grinding, and that the polyaspartic topcoat is what holds gloss through South Texas summers and survives the hot tire load. They sound like someone who has walked Bexar County concrete a hundred times because they have.

What a bad installer sounds like

The bad version answers each question in isolation and avoids specifics. Follow-ups make the answers vaguer rather than more specific. That is the conversation to walk away from before signing.

The specific San Antonio TX context to test for

The installer should know what makes Bexar County concrete different from a generic Texas slab. Test for that with a few local follow-ups.

• Thin soils over Edwards Plateau karst in Stone Oak, The Dominion, and toward Helotes and Boerne produce slabs with less seasonal movement than clay-subgrade slabs, but can still show differential settlement where soil depth varies.
• Older slabs in King William, Dignowity Hill, Government Hill, and the Pearl-adjacent stretches of Tobin Hill often have decades of UV-degraded laitance and possibly prior failed sealers.
• JBSA-adjacent communities like Universal City, Converse, and Schertz turn over residents on PCS cycles, so warranty transferability is a real concern for the next family who buys the house.
• South- and west-facing garage doors across Bexar County face UV intensity that destroys aromatic clear coats within two summers.

What to ask if the installer pushes a DIY-equivalent product

Some installers in the San Antonio market bid low by quoting a thin water-based coating closer to a DIY kit than a professional system. If the number seems low and the topcoat chemistry is vague, ask the question covered in our breakdown of DIY epoxy garage floor kits. A low-mil water-based product on a Bexar County slab that bakes through every South Texas summer is a coating that will fail inside two years no matter who applies it.

Book a free on-site assessment in San Antonio TX

Use these ten questions on every installer you bring out. A verified Amazing Garage Floors crew member answers every one of them on the walk-through, in plain language, with specific reference to your actual slab. The assessment happens on your property and you leave it knowing exactly what your floor needs. Schedule a free on-site assessment in San Antonio TX through the local hub and put these questions to a real crew.