Epoxy Resin
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Why concrete surface prep is the most important step of laying epoxy resin
If you’re preparing a concrete floor for epoxy resin, it’s easy to focus on the coating itself. After all, that’s the visible, glossy finish everyone wants.
But in reality, the finish is only as good as what’s underneath it.
Preparation determines whether your epoxy floor fails or lasts for years. Even the highest-quality products won’t bond properly to a poorly prepared surface.
In this article, you’ll learn how to:
- Clean and assess concrete
- Grind concrete for the best results
- Repair concrete cracks
- Test concrete moisture
Step 1: Clean and assess the concrete
Before grinding or coating concrete, you need a clean, stable surface to work with.
Start by removing anything that could interfere with adhesion:
- Dirt and dust
- Oil or grease stains
- Old paints or coatings
You’ll often need a degreaser for oil contamination and possibly mechanical removal for stubborn coatings.
Once the surface is clean, you can assess the condition of the concrete.
Look out for:
- Cracks (hairline or structural)
- Surface damage or spalling
- Signs of moisture (damp patches or discolouration)
This stage is about understanding what you’re working with. Skipping it can lead to bigger issues later, especially when it comes to bonding and durability.
Step 2: Grind the concrete surface
Concrete grinding is one of the most important steps in concrete floor prep. Why? Because it does two key things:
- Creates a rough surface profile for the epoxy to grip onto
- Removes weak or contaminated top layers of concrete
Without this step, the epoxy has nothing solid to bond with.
To grind concrete, you can use epoxy resin tools like a concrete grinder (either a floor grinder or a handheld, depending on the size of the area).
If you’re not sure what grinder to use, watch this video for a breakdown on the different types of concrete grinders:
These machines use different attachments (known as concrete grinding discs) to determine how aggressive the grind is, from heavy material removal to finer surface preparation:
- Grinding wheels. Best for light surface cleaning and smoothing, typically used on smaller areas or where you need a less aggressive grind.
- Grinding diamonds. Used for heavy-duty grinding to remove thick coatings and create a strong surface profile.
- Grinding trapezoids. Ideal for all stages of grinding, allowing you to switch from aggressive removal to finer surface preparation.
Step 3: Prepare for dust control
Grinding produces a large amount of dust. Any dust left behind can interfere with adhesion later, so controlling it early saves time and effort.
Here’s how to get dust under control:
- Use a vacuum attachment where possible to capture dust at the source and stop it from settling back onto the surface
- Keep the workspace well ventilated to reduce airborne dust and improve overall air quality while you work
You should also vacuum the entire surface (including corners and edges) and wipe with a microfiber or tack cloth to ensure no visible dust or debris remains.
Step 4: Repair concrete cracks and imperfections
Concrete cracks might seem minor, but they can cause major problems once epoxy resin is applied. They can weaken the surface, reflect through the epoxy coating, and they may expand over time if left untreated.
If you’re wondering how to repair cracks in concrete, here’s a simple overview:
- Fill cracks with a suitable repair compound
- Level out uneven areas with a concrete grinder or self-leveling compound
- Allow repairs to fully cure before moving on
If you’re unsure how to handle specific types of damage, it’s worth learning proper concrete crack repair techniques rather than guessing. Poor repairs will show through the final coating.
Step 5: Moisture test the concrete
Before applying epoxy, it’s essential to confirm that the concrete floor is completely dry. Moisture trapped within the slab can rise to the surface over time, causing the epoxy coating to bubble, peel, or fail to bond properly.
Here’s how to test for moisture:
- Tape a plastic sheet (approx. 2×2 ft) tightly to the floor, sealing all edges
- Leave it in place for 24 hours
- Check underneath for condensation or dampness
If you see any condensation or dampness, moisture is present in the concrete. In this situation, you shouldn’t proceed with the epoxy application yet.
The floor needs more time to dry, or you may need to use a moisture barrier solution.
Step 6: Perform the final checks for preparing concrete floor for epoxy
The last step involves doubling back on your efforts to make sure you’ve done everything you can for epoxy floor prep.
Here’s a quick overview:
- Dust fully removed
- Surface is clean and contaminant-free
- Repairs are complete and cured
- Correct surface profile achieved
- Moisture check passed
Get concrete surface prep right with proper training
If you want to feel confident in how to prep a concrete floor for epoxy, it’s worth investing in the right knowledge before you start.
Proper training helps you avoid costly mistakes, work more efficiently, and achieve a professional, long-lasting finish. Customers will be happier with the end-result, and you’re more likely to get repeat business or recommendations off the back of it.
Explore our training course to learn the full process and get it right first-time.
