The single best predictor of whether your floor coating lasts is not the brand of resin. It is whether the installer mechanically grinds the slab before coating it, and whether they will put their preparation process in writing.
Everything else, the warranty language, the sample board, the color chart, sits on top of that one decision. Here is how to tell a company that will still be standing behind your floor in ten years from one that is selling a weekend.
The 9 Questions to Ask Before You Sign
1. Do you grind the slab, or acid-etch it? Grinding is the right answer. Diamond grinding removes the weak top layer of the concrete and leaves a consistent mechanical profile the resin can key into. Acid etching is a chemical shortcut that leaves contamination behind and produces an uneven profile. If the answer is etching, or if they get vague, that is your answer about the whole job.
2. Will you moisture-test the slab first? Concrete pushes water vapor upward. If the slab is moving more vapor than the coating can tolerate, the coating will bubble, cloud or delaminate, sometimes months later. A calcium chloride or relative humidity probe test costs very little and prevents the most expensive kind of failure. Basements especially.
3. What exact product and system are you installing? You want the system named: base coat, broadcast, topcoat, mil thickness. "Epoxy" is not a specification. A company that cannot tell you what is going on your floor is a company that buys whatever was cheapest that month.
4. How do you handle cracks, spalling and oil contamination? Every older Colorado slab has some of this. The answer should describe routing and filling cracks, patching spalled areas, and remediating oil-soaked concrete, not "we'll coat right over it."
5. Is this quote based on measured square footage? A real quote states the area. A flat number with no measurement means either they have not looked properly or the number will change once work starts.
6. What is the total cure time before I can walk on it and park on it? Reasonable answers: walkable the same evening, vehicles in about 24 hours for polyaspartic; considerably longer for epoxy, especially in a cold garage. If someone promises you can park on fresh epoxy overnight in February, they are guessing.
7. Who is actually doing the work? Ask whether it is their own crew or a subcontractor, and how long that crew has been installing this system. Fast-curing polyaspartic is unforgiving of inexperience, it does not give you time to fix a mistake.
8. What does your warranty actually cover, and what voids it? See the warranty section below. The exclusions matter more than the headline.
9. Can I see three local jobs from more than two years ago? Anyone can show you a floor they finished last week. A coating's real test is what it looks like after two Colorado winters. Ask for older work, in your area, and drive by if you can.
Red Flags in a Quote
Acid etching instead of grinding
Covered above, and worth repeating because it is the number one cause of the failures we get called to strip out and redo. If the quote does not mention mechanical preparation at all, ask why.
A price with no square footage
Coating is priced per square foot for a reason. A quote that skips the measurement is a quote that can be revised upward once your garage is empty and half-ground.
Same-day pressure to sign
Discounts that expire when the salesperson leaves your driveway are a sales technique, not a price. A real quote is good for a reasonable window. Take the time to compare.
A price far below everyone else
In this trade, the cheap number almost always comes out of preparation, because that is the most labor-intensive and least visible part of the job. You cannot see missing prep. You will see it in three years.
What a Real Warranty Covers, and What It Does Not
Warranty language in this industry is often written to sound stronger than it is. Read for these things:
- Does it cover the bond? Delamination and peeling are the failures that matter. A warranty that covers only "manufacturing defects in the resin" covers almost nothing, because the resin is rarely the problem.
- Is it workmanship, material, or both? They are different promises, often from different parties. A manufacturer's material warranty does not obligate your installer to come back.
- What voids it? Common exclusions: moisture from below, slab movement, de-icing chemicals, improper cleaning. In Colorado, a warranty excluding de-icer damage and slab movement excludes the two things most likely to happen.
- Is it transferable, and is the company likely to exist? A long warranty from a company that has been operating for eighteen months is a marketing number.
4 Corners provides full workmanship warranties on every project. Ask us or any company you are considering, for the terms in writing before you sign.
Why Colorado Adds Its Own Requirements
A contractor who does good work in a mild climate may still be wrong for this one.
- Cure temperature. Between October and April, slab temperature decides what can be installed. A company that only installs epoxy will tell you to wait until spring. A company running polyaspartic and polyurea usually does not have to.
- Freeze thaw movement. The Front Range cycles through freezing far more often than most of the country, and mountain towns more still. A rigid coating on a moving slab cracks. Flexibility is a requirement here, not a feature.
- Magnesium chloride. Colorado's de-icer is harsher on concrete than rock salt. Ask specifically whether the system resists it.
- Altitude and UV. From Grand Junction at 4,583 feet to Telluride at 8,750 feet, high altitude sunlight is intense. Non-UV-stable coatings yellow noticeably in garages with the door open in the afternoon.
Licensing, Insurance and Reviews: What to Actually Check
- General liability insurance. Ask for a certificate, not a claim. Verify it covers the work being done at your address.
- Workers compensation. If an uninsured installer is hurt on your property, that can become your problem.
- Reviews with photos, over time. Look for reviews more than two years old, and for how the company replied to the bad ones. A pattern of responses is more informative than a perfect average.
- A real local footprint. A local address, local project photos, and jobs you can actually go look at.
Frequently Asked Questions
How do I choose a concrete coating company? Start with preparation. Ask whether they diamond grind or acid-etch the slab, and whether they moisture-test before coating. Then confirm the specific system being installed, get a quote based on measured square footage, and ask to see local jobs that are more than two years old.
What questions should I ask an epoxy flooring contractor? The most important are: do you grind or etch, will you moisture-test, what exact system are you installing, how do you handle cracks and spalling, what does the warranty cover and what voids it, and can I see older local work.
How much should a garage floor coating cost? General Colorado market ranges run roughly $3 to $7 per square foot for epoxy systems and $5 to $12 for polyaspartic, with the per-foot rate dropping on larger floors. Quotes far below that range usually save money on preparation. An on-site estimate is the only accurate figure.
Is a lifetime warranty on a garage floor real? It depends entirely on the exclusions and on whether the company will still exist. Read what voids it. In Colorado, a warranty that excludes de-icer damage or slab movement excludes the two most likely causes of failure.
Talk to Us Before You Decide
Ask us all nine questions. If our answers do not satisfy you, ask them of the next company, the questions are more valuable than the pitch.
4 Corners Concrete Coatings installs coated and polished concrete floors across the Denver metro and the Four Corners region, with diamond ground preparation, moisture testing, and full workmanship warranties on every project. Call (970) 292-7623 or request a free on-site estimate.
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Written by
4 Corners Concrete Coatings Team
Expert Concrete Coating Professionals
The 4 Corners Concrete Coatings team is led by co-founders Nathan Kaszynski and Blayde Roblin out of Fort Collins, Colorado. Together, they specialize in tra...
