When you're installing epoxy or polyaspartic coatings, one of the most common mistakes is trying to do it all in one coat. Whether you're working on a garage, a commercial floor, or a warehouse, understanding how each layer in the system works is key to getting professional, long-lasting results.
In this guide, we break down the purpose of each layer in a high-performance epoxy flooring system and explain how to choose the right products for each step.
The Three-Layer System That Professionals Use
Epoxy flooring isn't paint—it’s a chemical system built from the ground up. Each layer plays a specific role in performance, durability, and aesthetics.
The standard system looks like this:
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Primer
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Body Coat (also called the build coat or basecoat)
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Topcoat (optional but often essential)
Let’s look at what each does.
Primer: The Foundation of the Bond
Primers are the anchor of your system. They’re designed to penetrate the pores of the concrete and create a strong bond between the substrate and the rest of your coating system.
Depending on the condition of your slab, you might choose:
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Water-based epoxy primers for damp or green concrete (like Dymond BondMaxx 113)
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High-build epoxy primers for high-solids applications (like BondMaxx 127)
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Moisture vapor barrier primers if your slab is emitting vapor (like VaporShield 125)
If you skip this step or choose the wrong primer, you’re more likely to get issues like bubbling, peeling, or bond failure—especially on porous or contaminated concrete.
Body Coat: Build Strength, Color, and Thickness
The body coat makes up the bulk of your flooring system. This is where you build thickness, strength, color, and texture.
For example:
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SolidCor 217 is a 100% solids high-build epoxy designed for durable, chemical-resistant color coats
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SolidCor 212 offers a faster set time when rapid recoat or turnaround is needed
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Flake systems often use a tinted epoxy like BondMaxx 129 as the broadcast base layer
This is also the stage where decorative effects like flake, quartz, or metallic pigment systems are embedded.
Body coats can range from 10 mils to 30 mils or more depending on use-case. This layer is critical for impact resistance and long-term performance under foot traffic, equipment, or chemical exposure.
Topcoat: Lock It In and Add Protection
Topcoats are what protect the system from UV, abrasion, and staining. They also provide the finish—gloss, matte, or satin.
Two of the most popular types are:
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Polyaspartic topcoats like CrystalCoat 320 or 328, which offer fast return-to-service and high UV stability
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Aliphatic urethane topcoats like CrystalCoat 325, which have excellent chemical resistance and long-term wear properties
Not all systems require a topcoat. For example, some industrial epoxies can be left as-is if UV exposure or heavy chemical loads aren’t a concern. But in most garage, shop, or commercial settings, adding a high-performance topcoat is what separates professional results from weekend DIY coatings.
How to Choose the Right System
Think of your flooring system as a sandwich. The wrong layer in the middle or bottom will ruin everything on top. So the key is understanding your project needs and matching the system accordingly.
Here’s a quick cheat sheet:
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Moisture issues? Use VaporShield 125 as your primer.
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Quick turnaround? Use SolidCor 212 or CrystalCoat 320.
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Heavy forklift traffic? Choose a thick SolidCor 217 build coat and top it with CrystalCoat 325.
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Decorative flake finish? Use BondMaxx 129 as your base, flake it while wet, then lock it down with CrystalCoat 328.
Takeaway
Epoxy floors don’t fail because the product isn’t strong enough—they fail when the system underneath doesn’t match the job. By following a layered approach and choosing the right primer, body coat, and topcoat, you ensure better bond strength, more consistent finishes, and a floor that lasts.
If you're unsure what system is right for your space, contact the Dymond technical team or explore our full range of primers, body coats, and topcoats designed to work together from the ground up.
