Table of Contents
- What most homeowners get wrong
- The questions that separate a real installer from a cheap quote
- What determines whether a quote is comparable
- What happens when you get this wrong
- Why how a contractor prepares the slab matters
- The bottom line
- Frequently asked questions
Direct Answer
Ask two things: how they prepare the surface, and what grade of material they are putting down. Preparation, product grade and whether the crew owns industrial equipment are the three variables that separate two quotes on the same garage, and all three are invisible once the job is finished. A contractor who grinds the slab to white open porous concrete, tests concrete hardness and measures slab moisture before selecting a base coat, and repairs the cracks that grinding reveals is doing the work that decides the outcome. One who acid etches is taking the shortcut that causes most later failures.
Key Takeaways
- Two things decide how long a coating lasts: surface preparation, and the grade of product going down. Brand matters far less than either.
- Acid etching is the shortcut a cost-cutting contractor takes instead of grinding, and it is a common cause of coating failure.
- A comparable quote gives one price for the finished floor and describes the scope: prep, crack repair, base coat, flake coverage and topcoat.
- In-house crews mean one person is accountable from estimate to walk-through.
- A warranty that names peeling and delamination is a different promise from one that says ten years.
We have removed enough failed coatings from Charlotte-area garages to know that the homeowner almost always paid for a system and received a product.
We have been called in to redo enough failed coatings across the Charlotte metro area to know that almost every one traces back to the same short list of shortcuts.
What Most Homeowners Get Wrong
Most homeowners compare garage floor quotes on price and color, because those are the two things a quote makes visible. Everything that actually determines whether the floor is still bonded in five years sits in the part of the job nobody photographs.
The misconception persists because a coating over unprepared concrete can look just as good on handover day as a coating over properly prepared concrete. The difference does not appear until a season or two later, at which point the contractor who cut the corner is often no longer answering the phone.
The Questions That Separate a Real Installer From a Cheap Quote
How do you prepare the surface? The answer you want is mechanical grinding until the concrete is white, open and porous. If the answer is acid etching, an acid wash, or a chemical prep, that is the shortcut.
Do you test the concrete before grinding?
Concrete hardness decides which grinding tooling the machine needs. An installer who does not test is guessing at the most important step.
Do you test the slab for moisture?
Concrete moves moisture upward. A coating applied over a slab with high moisture can be pushed off from underneath, and that failure is not repairable without removing the floor.
What products are you putting down, and what is the solids content?
This question ranks alongside prep and almost nobody asks it. A 100 percent solid, industrial-grade base coat is a different material from the water-thinned epoxy in a hardware-store kit, and only one of them builds real thickness on a slab. A contractor who cannot tell you the solids content is either not using a product that has one worth quoting, or has not looked. Ask the same about the topcoat.
What happens to cracks you find after grinding?
Grinding is also what exposes the cracks a walk-through never shows. The answer you want is mechanical cleanout, a two-part polyurea crack mender, and grinding flush before the coating goes down.
Do you flake until the surface will not take another chip?
Flake broadcast until the surface will not accept more is what produces even color and consistent texture. Partial coverage shows as thin patches within a year.
How long have you been doing this, and can I see local work from the last year?
Both halves matter. Years in business without recent local photographs is a company that used to install floors, and a portfolio with no address attached is a portfolio you cannot verify. Reviews that describe the crew and the process are worth more than reviews that describe the color.
Can I talk to three people whose floors you did this year?
Consumer guidance asks for three to five references on similar work, and a contractor with a real book has no trouble producing them. Ask those homeowners two things: whether the crew left the garage clean, and whether anything came up after grinding that changed the price.
Who is actually installing it, and have they done this before?
A resinous floor is a timed chemical process, not a painting job. The crew has a working window once the material is mixed, and the difference between a floor with no roller marks and a floor with visible lines is a crew that has run that window a few hundred times. Ask whether the people arriving are employees or a subcontracted crew, and whether the person quoting will be on site.
Is the crew in-house or subcontracted?
This determines whether the person who quoted the job is accountable for how it was installed.
What exactly does the warranty cover?
Ten years is a number. Ten years against peeling and delamination is a promise about the specific failure mode that matters.
What Determines Whether a Quote Is Comparable
Two quotes on the same garage are only comparable if both describe the same scope.
Square footage and garage size. A one-car garage runs about 200 square feet, a two-car 400 to 500, a three-car 600 to 800. If the quote does not state the footage it measured, you cannot compare rates.
Prep scope. Read the quote for the work it names. Does it say the slab gets mechanically ground, that the edges and the apron get done by hand where the machine cannot reach, that cracks found during grinding get cleaned out and filled, and that any prior coating comes off first? Each of those is real labor, and a quote that does not mention them has not told you whether they are happening. That is what makes two quotes on the same garage comparable or not.
Base coat and topcoat. Which base, at what solids content and what thickness, and which topcoat. A quote that names no product grade is quoting a result without naming the material, and industrial-grade and retail-grade coatings can be a multiple apart in cost per square foot for the same visible finish.
Flake coverage. Full coverage, or partial, and full coverage is the install standard.
What is excluded. Moving stored items, coating the apron, vertical surfaces.
The most common gap between two quotes on the same floor is prep, and the cheaper quote usually got there by planning less of it. That gap is invisible in the total and visible in the scope, which is the whole reason to read the scope.
What Happens When You Get This Wrong
A coating over an unprepared slab does not wear out. It releases, in sheets, usually within the first year. Removing a failed coating costs more than the original install because the failed material has to come off mechanically before the slab can be prepared properly.
Skipped crack repair telegraphs through the finish within a season, and the repair now has to be made through a finished floor.
Partial flake coverage shows as uneven color and thin spots at the tire paths, and there is no way to add flake after the topcoat has cured.
In every case you pay twice: once for the failed floor and once for its removal.
Why How a Contractor Prepares the Slab Matters
Where a contractor cuts cost, there are two places it happens, and both are invisible in the finished floor. The first is the grinding, because it is the most expensive labor in the job. The second is the product that goes down: a water-thinned retail coating and a 100 percent solid industrial base coat look the same on a fresh floor and cost a multiple apart, so a quote can be cut on either one without the homeowner seeing it. An acid wash takes a fraction of the time an industrial grinder does and produces a surface that photographs the same.
A crew doing professional grinds every slab with an industrial grinder until the concrete is white, open and porous, and hand-grinds the edges and the apron. Concrete hardness is tested first to select the right grinding tooling, and slab moisture is measured before choosing between an epoxy and a polyurea base. Every crack the grinding exposes is cleaned out and filled. Flake is broadcast until the surface will not take another chip. The floor is scraped and vacuumed before the topcoat so no flake is left standing vertically.
David does every estimate himself and is on site through the final walk-through, which is the only reason we can answer these questions the same way twice.
When a cheaper contractor is genuinely the right call. If your slab is newer, bare, sound and has never been sealed, the job really is simpler and a smaller outfit with an industrial grinder can do it well for less. Not every low quote is a corner cut. The ones worth questioning are the low quotes on old slabs, previously coated ones, or slabs passing moisture, because that is the only place the saving can come from.
The Bottom Line
You are not buying a color, you are buying a bond, and the bond is decided by work you will never see. Ask how the slab gets prepared, ask what happens to the cracks that grinding reveals, and ask what the warranty actually names. A contractor who answers those three clearly is telling you how the floor will behave in year five. If you want those answers for your specific slab, the on-site estimate is where they get given.
