I hear the same eight or nine things over and over. They come from neighbors, from forums, from a guy at work who had a floor done in 2009, and from the comment section of every flooring video on the internet. Some of them are half true, which is what makes them durable. A myth that was completely wrong would have died already.
So here they are the way people actually say them to me, with the straight answer underneath. No hedging, and where the myth is partly right I will say so.
“Epoxy is epoxy, so it comes down to price”
This is the one that costs people the most money, and it is completely false.
Epoxy is a family of chemistry, not a product. Within that family the resins differ, the hardeners differ, and the ratio of actual solids to carrier differs enormously. That last number is where the meaningful difference lives. Solids content tells you what percentage of the bucket stays on your floor after the liquid portion evaporates. At one hundred percent solids, essentially everything you spread becomes floor. At forty percent, well over half of it leaves.
Then you have entirely different resin families that get called epoxy in casual conversation and are chemically nothing like it. Polyaspartics and polyureas cure by a different mechanism, tolerate a wider temperature window, and behave differently under ultraviolet light. Calling them all epoxy is like calling every car a Honda.
The way you cut through it is the technical data sheet. Every legitimate manufacturer publishes one for every product, and it will state solids content by volume, the mixed viscosity, the recommended film thickness per coat, the pot life, and the recoat window. Ask your installer which specific products are going on your floor and look them up. A contractor who will not name the product, or who says “commercial grade epoxy” and moves on, has told you something important. The data sheet is public, free, and takes two minutes to read.
“The kit from the big box store is the same stuff”
It is not, and I want to be fair to the kits at the same time, because there is a version of this myth that overcorrects.
The typical consumer kit is a water-based or low-solids epoxy that goes down at a very thin film, often measured in a few thousandths of an inch. It is designed to be rollable by somebody who has never done it, to have a forgiving pot life, and to fit in a box on a shelf. A professional system goes down at many times that thickness, in multiple layers, with a separate topcoat, and the base and top are usually different chemistries chosen for different jobs.
Film thickness is not a bragging number. It is what determines whether the coating can absorb an impact, resist a rolling load, and last through years of abrasion without wearing through to the concrete. A thin film has less material to lose before it is gone.
Where the kits are genuinely fine: a spare slab, a shed, a laundry room, a workshop floor where the goal is “cleaner and lighter than bare concrete” and nobody expects a decade. If that is the ambition and the budget, a kit applied carefully is a reasonable purchase and I will not pretend otherwise. Where they fall down is a two-car garage with vehicles on it, because the surface prep a kit’s instructions call for is usually an acid etch, and etching does not produce the mechanical profile a real system needs. That is the actual failure mode. Not the resin, the preparation the resin was sold with.
“It will turn my garage into an ice rink”
Texture is a specification, not a property. Whoever pours your floor decides how much grip it has, and it is chosen on purpose before anything is mixed.
A smooth resin surface with water on it is slick. That part is true and I will never tell you otherwise. What the myth misses is that nobody has to leave it smooth.
There are two ways to build in grip. The first is broadcast: while the coat is wet, material gets thrown into it across the whole surface, and once the clear coat goes over the top you have relief under your foot. Vinyl chips do this on a flake floor as a side effect of the look. On a floor where the chips are not part of the design, a fine aggregate does the same job invisibly.
The second is an additive mixed directly into the topcoat. Aluminum oxide, polymer beads, or a fine silica, at a dose chosen to match the room. This is the one I reach for most on smooth floors because you can tune it precisely.
The tradeoff is real and worth stating: more grip means more texture, and more texture holds dirt slightly more and drags a mop slightly more. So the conversation is about where on that scale your floor should sit, which depends on whether people walk in barefoot, whether wet shoes come in from the rain, and whether there are stairs or a slope. In this climate I bring it up on every single job. A floor you have to be careful on is a floor you will resent.
“Coatings crack in the Florida heat”
The cracks are real. The attribution is wrong.
A resin coating is bonded to the concrete along its entire underside. It has no independent life. Whatever the slab does, the coating does, because it is physically attached to it. So when a crack appears in a coated floor, the coating did not fail on its own and then crack. The slab moved and the coating went with it.
Concrete moves for reasons that have nothing to do with what is on top of it: thermal expansion, drying shrinkage that continues for years, settlement of the fill underneath, and in this state, tree roots and a water table that comes and goes with the season. That movement was going to happen whether or not anyone ever coated the floor.
What a good installer does is deal with the movement rather than pretend it away. Existing cracks get routed out into a proper channel and filled with a flexible repair material that can stretch a little rather than a rigid filler that will simply crack again in the same line. And control joints, the deliberate saw cuts in the slab, are treated as what they are. They exist so the concrete cracks where somebody chose rather than randomly. Filling them with a flexible joint sealant lets them continue to do their job under the coating. Rigidly coating straight over a control joint and hoping is how you get a crack telegraphing through a new floor in year two, and it is a preparation decision, not a material defect.
None of that makes a floor immune to a slab that is actively moving. It means the coating stops being the thing that gets blamed. Our approach to the slab side of this is covered under concrete surface preparation.
“My concrete is too old for this”
Old is usually good news. I would rather coat a thirty-year-old slab than a two-month-old one.
An old slab has finished the bulk of its shrinkage, it has settled into whatever position it is going to hold, and it has revealed its problems already. Every crack it was going to develop from curing has developed. A very new slab is still giving off moisture and still moving, and coating it too early is a genuine mistake.
Age also does not mean weak. Concrete gains strength for a long time. What matters is the condition of the top layer, and prep is what addresses that. Grinding removes the tired surface paste, any old sealer, adhesive residue, and paint, and exposes sound material with a profile for the resin to key into. Under a coated floor, a slab that looked hopeless is frequently the better substrate, because grinding it revealed solid concrete a few thousandths down.
Stains are the same story. Oil that has been soaking into a garage floor for twenty years feels like a disqualifier and usually is not, because the contamination is in the top layer and the top layer is what comes off. Deep oil saturation in one spot needs specific treatment, but a generally stained old floor is routine.
The two things that actually disqualify a slab are different from what people worry about. The first is moisture. A slab passing significant vapor up through itself will push a coating off from underneath no matter how well it was applied, and that is a measurement, not an opinion. The second is contamination that cannot be removed, most commonly a silicone or a curing compound that has penetrated deeply, or an oil saturation that goes all the way through. Those are real. Age, cracks, stains, and general ugliness are not. If somebody looked at your old floor and said it could not be done, get another opinion before you believe it. The detail on garage work is on the garage floor coatings page.
“Epoxy always yellows eventually”
Two separate things get folded into this complaint and they have different causes and different answers.
The first is amine blush. Epoxy cures through a reaction between resin and a hardener, and under humid conditions the hardener component can react with moisture and carbon dioxide in the air at the surface instead. What you get is a waxy, sometimes greasy, sometimes yellowish film sitting on top of the cured coating. It is a surface artifact, not the coating itself changing color, and it is a curing-condition problem. Managed correctly it does not happen; when it does happen it can usually be washed off and the coat recoated, though it has to be dealt with before the next layer goes on or that layer will not bond.
The second is real, and it is UV ambering. Standard epoxy is an aromatic chemistry, and aromatic resins are not stable under ultraviolet light. Exposed to sunlight over years they shift warm. This is genuine, it is well documented, and no amount of marketing changes it.
The answer is the topcoat. Aliphatic resins, which is where most quality polyaspartic and polyurethane topcoats live, are formulated to be UV stable and hold their color under sun exposure. On a floor that will see daylight, the aliphatic topcoat is not an upgrade to consider, it is the correct specification. The epoxy underneath can stay aromatic because it is not the layer taking the light.
So the honest version of the myth is: uncoated epoxy in the sun ambers, and a properly topcoated system does not. If a floor yellowed, somebody either skipped the topcoat or used the wrong one. Sunroom, lanai, and garage-with-the-door-open work all get specified with this in mind, and it is worth asking about explicitly rather than assuming.
“It is just expensive floor paint”
Paint and resin do fundamentally different things, and the difference is worth understanding in plain language.
Paint is pigment carried in a liquid. You spread it, the liquid evaporates, and what remains is a thin colored film sitting on the surface. Nothing chemically changes. That is why paint on a garage floor peels in sheets: it is a skin lying on top of the concrete, and once something gets under an edge, the sheet comes up.
Resin cures. Two components get mixed and a chemical reaction builds a cross-linked solid that did not exist in either bucket. It is not a dried film, it is a new material formed in place, mechanically locked into the profile that grinding put into the concrete.
The practical differences follow from that. Film build: paint measures in a couple thousandths of an inch, a professional system in many times that. Bond: paint adheres to the surface, resin keys into an opened profile. Chemical resistance: gasoline, brake fluid and solvents lift most floor paints and sit harmlessly on a cured resin until you wipe them. Abrasion: paint wears through in the traffic lanes within a couple of years while resin has real material to give up.
You can see the distinction with your own eyes on any peeling garage. Paint fails by delaminating in sheets that you can pick up. A properly bonded resin system does not do that, and when a resin floor does fail it is almost always because the slab underneath it was not right, not because the coating gave up.
The one that matters most: “they all do the same thing”
This is the myth that produces the worst outcomes, because it turns the decision into a price comparison between things that are not comparable.
The resin is not the variable. Two installers can be using an identical product and produce floors with completely different lifespans, because what separates them is everything that happened before the resin came out of the bucket. That work is invisible in the finished floor, which is exactly why it is the first thing cut when somebody is competing on price.
So here is a test you can run yourself, during the walkthrough, without knowing anything about chemistry.
Ask how the slab will be prepared, and listen for a specific mechanical answer. Diamond grinding to a stated profile, or shot blasting. If the answer is acid etching, a chemical wash, or a pressure clean, you have your information.
Ask whether they will test for moisture and how. There are standard methods, and somebody who does this seriously will name one without hesitating and will tell you what happens if the number comes back high. “We can tell by looking” is not a method.
Ask what specifically goes on your floor, by product name, and how many coats. Then look up the data sheets.
Ask what happens to the cracks and the control joints, and listen for routing and flexible filler rather than “we fill those.”
Ask for it in writing. Not a number on a page. A written system: the prep method, the products, the number of coats, the topcoat, and what happens if the moisture test changes the plan. Somebody who will put that on paper is somebody who intends to do it.
Any installer worth hiring will enjoy those questions, because they are the questions that let good work distinguish itself. If they get impatient, that is your answer. Our flake systems and how they are specified are on the flake epoxy flooring page if you want to see what a written system looks like laid out.
Straight answers to the questions behind the myths
Q. How do I check whether a product is actually good? Get the product name from your installer and pull the manufacturer’s technical data sheet, which is public and free. Look at solids content by volume, recommended film thickness per coat, and the recoat window. High solids means more of what you buy stays on the floor. An installer who will not name products is the finding, not the data sheet.
Q. Is a store-bought kit ever the right call? Yes, for a shed, a laundry room, a spare slab, or a workshop where the goal is cleaner and brighter than bare concrete and nobody expects a decade out of it. Applied carefully it will look fine for a while. It is the wrong tool for a garage with vehicles on it, mostly because kits are sold with an acid etch as the preparation, and etching does not create the profile a durable floor needs.
Q. My garage floor already has cracks. Does that rule me out? No. Cracks are ordinary and they get routed out into a proper channel and filled with a flexible material rather than coated over. Control joints get a flexible sealant so they can keep moving. What actually disqualifies a slab is high moisture vapor transmission or contamination that cannot be ground out, and both of those are things you measure rather than guess at.
Q. Will a coated floor be slippery when it is wet? Only if it was specified smooth. Grip is chosen: either a fine aggregate broadcast into the wet coat or an anti-slip additive mixed into the topcoat, dosed to suit how the room is used. More texture means slightly more dirt retention and a mop that drags a bit more, so it is a real tradeoff worth discussing rather than a box to tick.
Q. Why do quotes for the same floor vary so much? Almost always because of prep and film build, which are the two things you cannot see once the floor is finished. Grinding a garage properly with the edges done and the dust contained takes real time, and moisture testing sometimes changes the plan and adds a step. A quote that skips both of those is cheaper for a reason. Compare written systems, not numbers.
If one of these has been sitting in the back of your mind and stopping you from doing anything about your floor, call me at (941) 504-9132 and just ask. I would rather spend ten minutes on the phone than have somebody talk themselves out of a floor over something that was never true. Or tell me about your slab in writing and I will tell you honestly what it is a candidate for.