What questions should I ask a garage floor coating installer before signing?

Choosing a garage floor coating installer is a decision most homeowners make exactly once, and the difference between the right contractor and the wrong one shows up in years three through ten of the floor's life. By that time the salesperson is long gone, the warranty is either honored or not, and you are living with whatever decisions got made during the sales conversation. The right questions, asked in the right order before you sign anything, separate the verified installers from the operations selling you a thin product applied over unprepared concrete. Here are ten questions to ask, what a strong answer sounds like, and what a bad answer tells you about the company.

Why the Right Questions Matter

Garage floor coating is a category where the worst products and the worst installation practices are often the most aggressively marketed. A homeowner who has not done the research can be sold a thin consumer-grade system applied without diamond grinding that looks great for about eighteen months and then fails. The questions below filter out the operations not equipped to give you straight answers.

Treat the answers as a unit. A company that gives strong answers to nine and dodges one is telling you where they cut corners. A company that gives weak answers to most is telling you they do not have the verified crew or system to deliver a floor that lasts. For a broader view of what a full installation actually includes, see our breakdown of the garage floor coating project scope.

The Ten Questions in Order

1. Do you diamond grind the concrete, and at what grit?

   Diamond grinding is the foundation of every coating that lasts. The answer should be yes, with specific grit selection driven by slab condition. A strong answer references the metal-bond diamond grit range used for opening the slab. A bad answer is a vague reference to acid etching or surface preparation without specifics. Acid etching alone is not adequate prep for a long-life coating system. If they cannot tell you what equipment they use, they probably do not own it.

2. What is your moisture test process?

   The answer should reference the American Society for Testing and Materials standards: ASTM D4263 plastic sheet, ASTM F1869 calcium chloride, or ASTM F2170 relative humidity probe. A strong answer explains which test is appropriate for which slab condition. A bad answer is a hand wave about how the slab looks dry or how moisture is not really a problem in this market. Moisture is a problem in every market under the right conditions, and it is the leading preventable cause of coating failure. For the full breakdown of why this matters, see our piece on how to test concrete for moisture before installing epoxy.

3. What basecoat chemistry are you using, and how thick is the applied film?

   The answer should be a high-solids epoxy basecoat, typically 100 percent solids or close to it, applied at a film thickness measured in actual mils. A strong answer tells you the product family and target film thickness. A bad answer is a reference to a thin paint-like product, a water-based epoxy, or vague language without numbers. A basecoat that is essentially decorative paint will not hold flake, bond reliably, or survive even a few years of garage use.

4. Is the topcoat UV-stable polyaspartic?

   For any floor that sees natural light through a garage door, UV stability in the topcoat is non-negotiable. The answer should be yes, with a specific reference to polyaspartic or polyurea chemistry rather than a standard epoxy clear. A strong answer explains that the polyaspartic topcoat resists yellowing, chalking, and UV breakdown over the warranty period. A bad answer is a thin epoxy clear topcoat that will yellow within two to three years of installation.

5. Do you do the prep and install in one day or schedule them separately?

   Most residential garages should be one-day installations: diamond grind, basecoat, flake broadcast, and polyaspartic topcoat all the same day. A strong answer is a confident yes with the cure schedule that follows. A bad answer is a multi-day schedule that leaves prepared concrete exposed overnight or runs the basecoat and topcoat on separate days, which creates bond issues between layers. Exceptions exist for large commercial floors and for installs requiring vapor mitigation.

6. What is the cure schedule for walk-on and drive-on?

   The answer should be specific: walk-on typically the evening of the install or the next morning, drive-on typically 72 hours after the topcoat goes down. A strong answer explains how the polyaspartic chemistry allows faster cure than standard epoxy systems and what conditions can affect the cure timing. A bad answer is a vague reference to letting it cure for a week or unrealistic same-day drive-on claims.

7. What are the warranty terms, in writing?

   The answer should be a written warranty document you can take home and read. Amazing Garage Floors offers the Limited 15 Year Warranty on our full residential installations, with terms describing what is covered, what is excluded, and the claims process. A strong answer hands you the document. A bad answer is a verbal warranty, a vague "lifetime" claim, or refusal to provide documentation until after you sign. If the warranty is not in writing, it does not exist. Be wary of any installer who uses "lifetime" without defining what that means in years, because the term is almost always used to obscure that the actual coverage period is much shorter.

8. What is your scope for crack and spalling repair?

   Real concrete repair is part of a real installation. The answer should describe the materials and techniques used for filling cracks, repairing spalled areas, and addressing damaged control joints. A strong answer references structural epoxy injection or polyurea fill, depending on the crack type, and describes how the repaired area is leveled and feathered into the surrounding slab before coating. A bad answer is a reference to skim coating or covering cracks with the basecoat, both of which will telegraph through the finished floor and reopen with seasonal slab movement.

9. Are you the actual installer or a sales rep for a separate crew?

   This question gets at the structure of the company you are hiring. A verified Amazing Garage Floors crew member can tell you who will be on your job and what their training looks like. A strong answer is direct and specific. A bad answer is a sales pitch that handles the conversation but cannot tell you anything about the install crew, who often turns out to be a separately contracted team with variable quality. The person on the sales call should know the people doing the install.

10. Are you insured, and what is your verified-installer status?

    The answer should be a yes with specifics: general liability insurance, workers compensation for the crew, and verified-installer status with the manufacturer of the coating system being installed. A strong answer hands you insurance documentation and explains what verified-installer status means for warranty coverage. A bad answer is a vague claim of being insured without documentation, or no clear relationship to the product manufacturer. If the installer is not in good standing with the manufacturer, the manufacturer warranty does not apply.

How to Use the Answers

You do not need a perfect ten-for-ten. What you need is a clear pattern. An installer who answers eight questions with technical confidence and stumbles on two is a different signal than one who gives vague or evasive answers to most. Watch for these high-confidence red flags during the conversation:

• Pressure to sign on the spot with a discount that expires at the end of the visit.
• Refusal to provide written warranty terms before the contract is signed.
• Use of the word "lifetime" without a defined number of years.
• Vague answers about whether the actual installation crew is in-house or subcontracted.
• No equipment-specific reference to diamond grinding, only acid etching or "surface prep."

By the time you have asked all ten questions and listened to the answers, you understand what diamond grinding does, why moisture matters, why polyaspartic is the right topcoat, and what the realistic cure timeline looks like.

What a Verified Amazing Garage Floors Assessment Looks Like

The on-site assessment is built around the same questions. A verified crew member arrives at your address, walks the garage with you, evaluates the slab for moisture, cracking, surface condition, and contamination, and explains the system that fits. Diamond-grind prep, high-solids epoxy basecoat, full vinyl flake broadcast, UV-stable polyaspartic topcoat, and the Limited 15 Year Warranty are all standard.

If you are interviewing installers for a garage floor project, schedule a complimentary on-site assessment with a verified Amazing Garage Floors crew. We serve homeowners through a national verified installer network with consistent system specifications across every market, including Dallas, Nashville, and Cincinnati.