What's The Difference Between All The Primers, Epoxies And Topcoats Out There?
Posted by ArmorGarage LLC on Aug 21st 2025
What You Should Know About Each Layer of an Epoxy Floor System
Primers, base coats, and topcoats — what each layer does, why it matters, and how to tell quality from marketing hype
A complete epoxy floor system has three layers applied in sequence: primer, base coat, and topcoat. Each layer does a specific job, and skipping or downgrading any of them is the most common reason epoxy floors fail. Quality 100% solids epoxy with a urethane topcoat lasts 15–20+ years. Cheap systems that skip the primer or topcoat fail in 1–3 years.
There are a lot of different products on the market today, which can be confusing and even misleading. In this article, we'll walk through each layer of an epoxy floor system in the order they're applied, explain what each layer does, and show you how to tell quality from marketing hype.
Layer 1: The Primer — Your Foundation
The primer is the unsung hero of an epoxy floor system. It goes down first, after the concrete is properly prepped, and its job is to lock the entire system into the slab. A good primer doesn't just sit on top of your concrete — it penetrates into it.
The ArmorGarage primer is our 100% military-grade epoxy thinned down with solvents so it soaks into the open pores of your concrete — pores that are created when you properly prepare the surface. Once inside, it expands as it cures, locking itself into the pores and creating a bond that can only be broken by removing the top layer of your concrete itself. ArmorGarage epoxies are all self-priming, but it's always a good idea to prime your floor other than for light daily garage parking usage.
Why Cheap Systems Don't Offer the Primer
Most big-box store epoxy kits don't include a primer because adding one would push the price out of the "budget" category they're competing in.
Think About That: Our primers alone outperform 90% of the actual floor epoxies on the market. That's the foundation your ArmorGarage floor is built on.
When You Need a Primer
ArmorGarage epoxies are technically self-priming, but a separate primer is a smart upgrade in several specific situations:
- When your floor is near the kit's max coverage — primer extends epoxy coverage because it goes over a sealed surface
- When the slab is older or porous — primer fills micro-pores for better base coat performance
- When the garage will be used as a workshop — extra build handles tool drops and rolling equipment
- When you have heavier off-road vehicles or equipment — total build matters more than typical garage use
- When you want maximum durability and longest possible service life
Layer 2: The Base Coat — Understanding Epoxy Types
The base coat goes on after the primer cures. This is the colored layer that gives your floor its appearance — gray, charcoal, tan, or whatever color you've chosen, often with decorative flakes broadcast into it. The base coat is also where epoxy quality matters most, because the type of epoxy used determines how thick the cured film actually is and how long it will last.
Not all epoxies are created equal — the differences are enormous, and they directly determine how long your floor will last.
Water-Based Epoxy
A water-based epoxy has a percentage of hardeners and resins and a percentage of water — usually between 40–50%. As the coating dries, that 40–50% evaporates out as water vapor, leaving a very thin film on your floor surface. It's why water-based epoxies have a very poor performance record.
Bottom Line: Water-based epoxies leave up to half their volume behind as nothing — you're literally paying for water that evaporates. The resulting film is too thin to withstand any real traffic.
Solvent-Based Epoxy ( High Solids Epoxies)
Solvent-based epoxies have a percentage of hardeners and resins — just like water-based — but use solvents rather than water. The higher the solids content, the better. Medium to high solids epoxies should only be used as primers, not as base coats. Even a very small percentage below 100% makes a big difference in long-term performance.
100% Solids Epoxy — Where It Gets Tricky
The term "100% solids epoxy" is thrown around constantly in marketing. But there are major differences hiding behind that label, and not all "100% solids" products are what they claim to be.
⚠️ Beware of Fake 100% Solids:
Fake 100% solids — If you look at the spec sheet and notice it's only 100% in either weight or volume but not both, it's not a true 100% solids epoxy. This is misleading marketing.
Low-quality 100% solids — Some products are genuinely 100% in both weight and volume, but are made with cheap imported hardeners, resins, and pigments — or are entirely imported. The only thing that's 100% is that all of it is made with subpar materials.
If you poured a high-quality 100% solids epoxy next to a 97% solids epoxy, the difference is like milk and honey — that's how significant even a small percentage below 100% really is.
ArmorGarage epoxy is made of 100% military-grade solids and is 100% USA-made. It's why our floors last so long. You'll see examples and videos of floors that are 16 years or older that still look brand new.
Layer 3: The Topcoat — Your Shield
The topcoat goes on last, after the base coat cures. It's your floor's armor — the layer that takes 100% of the wear from tires, foot traffic, dropped tools, chemical spills, and abrasion. Its job is to provide abrasion resistance, scratch resistance, chemical resistance, and UV protection. Good topcoats are solids-based and use urethane as the other part of their composition.
The topcoat is the single most important layer in determining how long your floor stays looking new. A military-grade urethane topcoat can extend lifespan from 5–7 years to 15–20+ years for the same base epoxy. This is why cheap epoxy kits that skip the topcoat fail so quickly — the colored base epoxy is exposed directly to wear with no protective layer above it.
Avoid These Topcoats:
Water-based topcoats — offer very little of what a topcoat is supposed to do
Pure solvent-based topcoats — same problem, should be avoided at all costs
Clear epoxy as a topcoat — one competitor tried this and it was 100% worthless. Epoxies are not topcoats.
How to Judge a Topcoat
When evaluating any topcoat — not just ours — here's what to look at on the technical data sheet. These are the measurable specifications that determine real-world performance:
Abrasion Loss Rating — the lower the number, the better. This measures how much coating wears off as your tires twist and turn on the surface. ArmorGarage military-grade topcoat is 4 mg per 1,000 cycles — among the best in the industry.
Hardness Rating — the harder the better. A harder topcoat resists scratches more effectively. ArmorGarage cures to Shore D 80+, which handles vehicles and equipment without compression damage.
Composition — it should be made with solids and urethane. Urethane is to epoxy what rebar is to concrete — it's what gives the cured film its toughness and chemical resistance.
ArmorGarage topcoats have the best hardness and abrasion loss ratings in the industry. It's why our floors not only last the longest, but stay looking new the longest. Any epoxy coating can stick to your floor and look good right after you apply it. It's how long it stays looking new that counts.
How the Three Layers Work Together
Each layer of an epoxy system has a specific job, and the system only works when all three are present and quality. Here's how they function together once cured:
| Layer | Purpose | If You Skip It |
|---|---|---|
| Primer | Penetrates concrete pores and chemically locks the system into the slab | Bond strength is less; low quality epoxies stain & peel within 1–3 years |
| Base Coat | Provides color, decorative finish, and the structural film thickness of the system | No coating exists — this is the actual floor surface |
| Topcoat | Takes 100% of wear from traffic, chemicals, and abrasion; preserves the base coat underneath | Base coat wears down quickly; floor fails within 3-4 years instead of 15–20 |
The total cured film thickness of an ArmorGarage three-layer system is 14–30 mils depending on the specific kit. By comparison, a single-coat big-box store epoxy cures to 3–4 mils — one-fifth the thickness of a quality system. That difference in total build is why some floors last decades and others fail within months.
Real-World Proof
Side-by-Side: ArmorGarage vs. Home Improvement Store Epoxy
On our Garage Epoxy Flooring page, you'll see a section showing two parking spots next to each other in a condo building that lets owners coat their own spots. One owner used a home improvement store epoxy. The other used our Armor Chip Garage Epoxy Kit with our standard topcoat.
After a year or two, the home improvement store epoxy started looking shabby, stained, and dull. Ten years later, the ArmorGarage spot still looked great.
The Difference: The ArmorGarage customer only had to do a light sanding and roll on a new topcoat — and his floor came back looking brand new. He upgraded to the military topcoat, which means he'll probably never have to touch his floor again. The other owner? Full diamond grind and a complete redo.
The 16-Year Liquor Warehouse
In our Case Studies, we show a floor that looks like it went through hell and back. It's in a very high-volume liquor warehouse in South Jersey near Atlantic City — thousands of customers 7 days a week, 365 days a year, plus forklifts, pallet jacks, hand trucks, shopping carts, and dollies rolling over it nonstop.
After 16 years, the floor looks badly worn — and we couldn't be prouder of it. Any other epoxy coating would've been vaporized off that floor in no more than a year or two. The customer was so happy that they used the same Military-Industrial Three Layer Epoxy System on their new store.
It's like how long a car can last. A car that makes it to 500,000 miles in two years is a better car than one that only makes it to 100,000 miles in ten years before falling apart. We think the car that made it to 500,000 miles is the better car.
The Toughest Epoxy on Earth
To give you an idea of the ArmorGarage difference: we have a Heavy Tonnage Epoxy System that we call the Toughest Epoxy on Earth. It's not just for heavy loads — it's a super heavy-duty coating for any application that demands the absolute best.
When we made our first batch, we applied it to our warehouse floor and drove forklifts on it in circles with the forks pointed down on the floor — and there wasn't a mark. It has a hardness rating many levels higher than even construction hard hats. It's what bunker-hardened concrete is to regular garage concrete.
The Takeaway
A complete epoxy floor system is three layers, applied in sequence, each with a specific job: primer locks the system into the concrete, base coat provides the structural film and color, topcoat handles all the wear. Skip any layer or downgrade its quality, and the system fails. Build it right with quality materials, and the floor lasts decades.
When you're evaluating any epoxy product, ask three questions:
- Does it include a separate primer? If not, the bond strength is compromised from day one.
- Is the base coat true 100% solids in both weight AND volume? If not, you're paying for water or solvents that evaporate.
- Does it include a real urethane topcoat with a low abrasion loss rating? If not, your floor will start showing wear within a couple of years.
If you have any questions about which epoxy system is right for your project, please don't hesitate to give us a call or send us an email — we're here to help.
Browse our complete line of epoxy floor systems:
Garage Epoxy Flooring · Commercial Epoxy Flooring · Industrial Epoxy Flooring
866-532-3979 — info@armorgarage.com