Why Two Garage Floor Quotes Can
Differ by $3,000
Call four DFW contractors and you'll get quotes from $2 to $6+ per square foot for what sounds like the same floor. The gap isn't margin. It's what's underneath.
How They Prep the Slab
A chemical wash. Fast, cheap, and it does not open the concrete properly. Coatings over an etched slab are the ones that peel in sheets.
Mechanical profiling with industrial equipment. Costs $1–$2 more per square foot in labor, and it's the difference between a floor that bonds and a floor that lets go.
Prep is the majority of the real cost of a coated floor — not the resin. It's also invisible once the floor is down, which is exactly why it's the first thing cut on a lowball quote.
From a Cheap Quote
- Crack and spall repair skipped and coated over
- No moisture testing of the slab
- Fewer coats — or the same coats applied thinner
- No polyaspartic topcoat (or a thin sacrificial one)
- No edge and cove detail
- No warranty
Cheaper Once vs Cheaper Twice
A budget acid-etch install realistically gives you 3–7 years before it's peeling. A diamond-ground, properly built system gives you 15–20. Paying $2,500 twice in eight years is not cheaper than paying $4,000 once — and that math ignores the second demo, the second week without a garage, and the second round of dust in the house.
8 Questions to Ask Any Contractor
- 1.Are you diamond grinding, or acid etching?
- 2.What's your total system thickness in mils?
- 3.Is the topcoat polyaspartic, and is it UV-stable?
- 4.How are you handling cracks and spalling — repair, or coat over?
- 5.Are you moisture testing the slab first?
- 6.Does the price include the edges and cove base?
- 7.What exactly does your warranty cover, and for how long?
- 8.Will the person who quoted this be the one installing it?
Ask us these same eight questions. We'll answer every one of them on the phone before you ever book an estimate.
The Four Prep Methods In Order
The industry describes prep by CSP — Concrete Surface Profile, a 1–10 scale from smoothest to most aggressive. Different systems require different profiles; matching prep to system is what an honest bid should show.
Diamond grinding
Rotary heads with industrial diamonds cut a CSP-2 to CSP-3 profile — the mechanical tooth a coating needs to lock in. Standard for warrantied residential and commercial work. Adds $1–$2 per sq ft in labor and consumable diamonds. First failure mode: none tied to prep itself; failures come from an under-built topcoat above.
Shot blasting
Steel shot fired at the slab pulls an even, aggressive profile (CSP-3 to CSP-5) at production speed. The right call for very large industrial floors and slabs going under high-build systems. Overkill for a residential garage and it can leave shot tracks visible under thin coatings. First failure mode: profile too aggressive for a decorative topcoat, showing through the finish.
Acid etching
Muriatic-acid wash. Cleans surface laitance and lightly opens the top few microns, but doesn't create a mechanical profile. Common in the big-box kit. First failure mode: peeling in sheets 2–5 years in, especially at edges and doorways where flexing concentrates stress.
No prep / solvent wipe
A rag, a solvent, and rolled coating. This exists on the cheapest lowball bids and on rushed apartment turnovers. First failure mode: adhesion loss within the first summer. There is no legitimate coated-floor system that skips prep.
Six Red Flags In a Bid
No written scope
A verbal number is not a quote. Without a scope, the price can change and you have no leverage.
Priced over the phone, sight unseen
Slab condition, size, existing coatings, and moisture all move the number. A real quote needs eyes on the floor.
No mention of prep method
If the bid doesn't say diamond grind, shot blast, or acid etch, prep is the first corner that will be cut.
Deposit over ~50%
Material orders justify a deposit; carrying the contractor's cash flow does not. Anything over half up front is a risk.
No proof of insurance
Ask for a certificate of insurance naming general liability. This industry sees enough dust and slip-and-fall claims that skipping this is reckless.
Pressure to sign today
"This price is only good if you sign now" is a sales script. A legitimate scope holds for at least a week.
Questions That Expose a Low-Baller
"What happens if my slab tests high for moisture?"
Why it works: A prepared answer includes the test method (calcium chloride or in-situ RH), the trigger threshold, and the conditional line item for a vapor-barrier primer. A vague answer means moisture will become a change order.
"Who pays if the coating fails in year two?"
Why it works: A real warranty defines failure modes, remedy, and who eats material vs labor. "Lifetime" with no failure conditions attached is marketing, not a warranty.
"Are your installers employees or subcontracted day labor?"
Why it works: This isn't a slight against day crews — it's about accountability. Ask who owns the outcome, who trained the person on the trowel, and whether the crew you meet is the crew that pours.
What "Lifetime Warranty" Usually Means
Four things separate a real warranty from marketing copy. Ask about each — in writing — before signing anything.
Defined failure modes
Peeling, delamination from the substrate, hot-tire pickup, blistering — each named in writing. "Failure" without a definition means the installer decides case by case, which usually means no.
A defined term
"Lifetime" without a number is legally weak; ten years with a clear taper is stronger. Read the term as written, not as promised.
Transferability
Coatings that survive their warranty period often outlive the homeowner's stay. A warranty that transfers to the next owner has real resale value; one that voids at sale doesn't.
Who honors it if the company folds
Small local installers close every year. Manufacturer-backed warranties (through the resin brand) survive the installer; installer-only warranties don't. Ask which one is on offer.
How Not to Void Your Own Floor
Respect the cure schedule
Foot traffic on a modern hybrid system is usually safe within hours, but full chemical cure — the point at which the film reaches its rated hardness and chemical resistance — takes 5–7 days. Heavy loads, jack stands, and aggressive cleaners in that window shorten the floor's life.
Cleaners that damage a topcoat
Ammonia, citrus solvents, and abrasive powders soften or scratch polyaspartic and polyurethane topcoats. Neutral-pH floor cleaner and a microfiber pad clean the same floors that get destroyed by kitchen sprays and shop degreasers.
What actually causes hot-tire marks
Hot rubber sitting on a coating plasticises the surface locally. On an under-built or under-cured floor, tire pigment migrates in and stays. On a properly built system it wipes off. Pulling into the garage and immediately parking on a 130°F tire is the worst-case load — letting the tires cool for a few minutes before the final position helps on any coating.