Epoxy vs Urethane: Head To Head Comparison Between Them
Are you struggling when choosing between urethane vs epoxy for your floor? Then don’t worry – here we are going to help you out.
As you must know already, both epoxy and urethane are commonly used as floor coatings. They make it easy to protect concrete floors and to add new colors and/or appearances.
But despite both being used for covering similar type of floors as coating materials, they also hold several differences that could make it or break it for you.
Here, we want to show you all these differences and teach you all the different factors to consider before making a final choice.
So, ready to find out which type of coating is better for you? Our guide below has everything you need - so read up!
What Is Epoxy?
A thermosetting polymer that binds firmly to the floor and ensures hardness and durability – epoxy is one of the best floor coatings out there.
This polymer comes in 3 types: water-based, solvent-based, and fully solid. Each kind offers its own set of advantages and disadvantages, yet they all provide a similar experience.
Most epoxy polymers are used to cover floors at industrial facilities. It helps to protect as well as to achieve maximum flatness. Epoxy also adds an impact-absorbing capacity and even helps to increase grip and traction.
- Superb strength & adhesiveness
- Excellent chemical resistance
- Ultra-thick finish for durability
- Top-notch texture for extra traction
- Not resistant to UV rays
- Lack of flexibility makes it brittle
What Is Urethane?
Also, a thermosetting polymer, urethane is widely used as a coating for concrete floors. It is super durable and flexible – ensuring chemical and water resistance.
Urethane also comes in different types, but they mainly vary in fluidity. Of course, the thicker the formula, the stronger it is. So they are all similar, just some types are stronger than others.
This polymer is mostly used for coating floors that are already cured or primed. Urethane works amazingly well over concrete, yet it works even better over other polymers. It also provides UV resistance and increases overall reflectivity exponentially.
- Flexible & easy to apply finish
- Little application time and effort
- Leaves an extra-smooth surface
- Colors stay for long
- Thin layers
- Not resistant to chemicals
Epoxy vs Urethane: Factors to Consider
After learning about both urethane and epoxy in a general sense, it is time to learn in-depth.
Here are some factors you need to know about if you want to learn all there’s to know about epoxy and urethane:
Durability and Resistance
The first factor to think about would be the durability and overall resilience of the material.
Here, you will find that urethane is probably the most resistant and durable of the two. It can withstand drops and scratches, UV light, and even prevents yellowing or color loss over time.
Urethane is also resistant to chemicals, even the strongest ones. And they can also handle a lot of staining and even heat marks without problems. Even abrasion is not a problem that urethane can't handle – so you can guess how resilient this material is.
The only downside is that urethane is not as resistant to the chemical as it seems. It tends to wear off faster than usual when exposed to acidic substances.
In contrast, you will find epoxy, which is super resistant to chemicals. It can handle acidic and other substances well enough for years, without any adverse reaction.
Epoxy is also resistant and durable, withstanding all kinds of weather elements and conditions with ease. And sure enough, it works well against impacts, abrasion, and scratches.
But epoxy is not resistant to UV light, so it is not recommended for outdoor use like urethane. And it tends to get yellow over time, or simply lose some of its colors.
Here, you can guess that both epoxy and urethane offer their own set of advantages over the other. But urethane, despite its low chemical resistance, is still the sturdiest.
Another exciting factor to know about would be the thickness of the polymer when applied. Depending on the thickness, you can guess how effective it can be for different purposes.
For example, epoxy tends to take about 8 to 15 millimeters of the total thickness. This is a pretty thick layer that can cover cracks, blemishes, and even entire holes with ease. And that’s why it is often used to cover damaged floors.
On the other hand, urethane only takes about 2 or 3 millimeters of thickness. That’s way thinner than most epoxy layers, so it is not the best to pour over concrete or floors directly. Apart from that, it doesn’t bond as well – so it is mostly used as a protective coating – sometimes over epoxy itself.
The thickness of epoxy makes it a way stronger product, and sometimes more practical. Urethane, in contrast, is thinner but more flexible.
As you may guess from the thickness they work with, urethane is the more flexible of the two.
This happens not only because urethane works with thinner layers, but because it is by itself a more flexible material. A thick layer of urethane like epoxy would not feel hard, but somewhat squishy. That’s why it is mostly applied in thin layers to prevent it from making floors too soggy.
That makes urethane capable of working in curved and concave types of floors without problems. And to make it even better, it can withstand constant movement and vibration without breaking.
Epoxy, in contrast, is a way harder material. It can crack if applied on curved or concave surfaces, so it is mostly recommended for flat floors only. And sure enough, it doesn’t work well on floors that move or vibrate too much.
Adhesiveness / Bonding Strength
Another vital factor to know about urethane and epoxy is how well they stick to concrete. Here, you will find that epoxy does the job much better.
Even though epoxy has different types of polymer formulas and preparations, it is often the strongest. This happens because it bonds mechanically to concrete, thanks to its weight and overall hardness.
Of course, this depends heavily on the state of the concrete surface and the overall preparation before application. But still, epoxy tends to stick better to concrete than urethane.
This happens because urethane does not bond mechanically, being lighter, and often using a thinner layer – it doesn’t stick too well. Apart from that, urethane comes with a thin film that doesn’t pour into crevices or cracks, so it requires an entirely flat floor (preferably coated previously) to work well.
So, yes - urethane is usually not the best polymer when bonding with concrete.
How much does it take to apply urethane and epoxy? Well, it depends.
What we can say is that epoxy coatings have a big drawback, and that is how much time it takes to apply and dry. But the real disadvantage comes from the previous preparation.
Without proper priming, applying epoxy would be extremely difficult to the point of uselessness. And sure enough, the curing takes a lot of time.
Urethane is different. While it does need to be applied on previously cured/coated concrete to work well, it dries up super-fast. That’s why it is the preferred option for most quick jobs that don’t need the strength or adhesiveness of epoxy.
When it comes to application, epoxy tends to take too long – which makes it less convenient.
The texture may also become an essential factor, especially if it is installed in places where traction or smoothness is necessary.
Here, you’ll find that urethane performs way better than epoxy. This happens because urethane stays smooth for a long time without becoming brittle or losing any of its grip over time. In fact, urethane even remains smooth after years underwater.
Epoxy does not offer such texture capacity. It may become brittle over time, especially if exposed to sun rays. And it may also not maintain the grip under extreme conditions.
In the texture area, urethane is the best, especially for its slightly better resilience.
Last but not least, you’ll want to consider how attractive each looks on the floor. Here, both perform similarly well.
Urethane coatings have one advantage, and that’s the UV-resistance they offer. This makes them the preferred polymer for making paint or colored coatings. That’s why you’re likely to find semi-gloss, high-gloss, matte, or all types of colors with urethane coatings.
The same does not happen with epoxy. First, because epoxy tends to change color when exposed to UV light, it becomes less useful for coloring. And second, because its consistency tends to be higher, so adding colorants and dyes is often not easy.
But still, you may find colored epoxy coatings without problems. The color just won’t stick as well as color on urethane. And it doesn’t offer the same types of gloss as urethane does.
So, while both are pretty colorful – it is urethane that gets the prize for its resilience.
In the end, choosing between urethane and epoxy is mostly about picking either UV-resistance with fast application times or super-strong yet chemically-resistant materials.
If you prefer something that cures fast and looks impressive even under UV rays – then go for urethane. Just remember that it may not stick well enough to the concrete and that it is not too resistant to chemicals.
But if you want an ultra-strong bonding capacity with abrasion and chemical resistance – then epoxy is your best bet. It won’t resist stains or UV rays like urethane, yet it is still durable and often much more impact-resistant.
So, urethane vs epoxy- what you are choosing between them? Pick now, and get your floor coated with the best material!