Under the Surface: Choosing the Right Mr. JO Underlay for Your Epoxy Flooring Success
When it comes to epoxy flooring, what lies beneath truly matters. Whether you’re building a heavy-duty industrial floor or leveling out imperfections before a sleek topcoat, MR. JO Underlays provide the essential foundation for performance, durability, and finish.
With five robust systems—Eco, STD, CMR, FLO, and TMP—each tailored for specific applications, there’s a Mr. JO Underlay ready to meet your needs.
🔍 Why Use an Underlay?
Before you roll or pour your final self-leveling (SL) or protective epoxy layer, underlays help you:
✔️ Build up thickness cost-effectively
✔️ Achieve a smoother, more level base
✔️ Absorb substrate undulations and defects
✔️ Improve mechanical strength
✔️ Enhance the finish and longevity of the topcoat
Underlays are typically recommended for floors ≥2 mm thickness, and not usually required for 0.5 or 1 mm systems—unless the substrate is heavily uneven or damaged.
🔬 The MR. JO Underlay Lineup — Explained & Compared
| Product | Mix Ratio (A:B:Filler) | Type | Key Use | Filler Load Options | Speed / Workability | Special Features |
| MR. JO EcoUnderlay | 100:50:250 (iFLO) or 100:50:650 (iTMP) | Flowable / Tampable | Fast-setting floors with quick return to service | iFLO – flowable (12.5 kg) iTMP – tampable (32.5 kg) | ⏱️ Very Fast | Optimized for EcoFloor; minimal downtime |
| MR. JO Underlay-STD | 100:50:275 (flowable) | Flowable | General purpose industrial floors, covings, ramps | Flexible filler load | ⚙️ Fast | Cost-effective and easy to apply |
| MR. JO Underlay-CMR | 100:60:650 (tampable) | Tampable | Chemical plants, ETPs, bunds | High resistance to acids & alkalis | 🧪 Moderate | Based on chemical-resistant backbone |
| MR. JO Underlay-FLO | 100:50:250 | Flowable Only | Seamless epoxy flooring base layer | Fixed load (12.5 kg filler) | 💧 Moderate | Based on BondKot LVC – high bonding strength |
| MR. JO Underlay-TMP | 100:50:650 | Tampable Only | Ramp areas, coving, base buildup (5–8 mm) | Fixed load (32.5 kg filler) | 🧱 Slow | Tampable mass for hand/machine troweling |
Which One Should You Use?
Here’s how to choose based on floor function & site priorities:
- Tight timeline? → Go for Eco Underlay for quick curing
- Economy & flexibility? → STD Underlay is your go-to
- Chemical-prone areas? → CMR Underlay holds its ground
- Regular SL epoxy flooring? → Use FLO Underlay as base
- Need to trowel or build ramps/covings? → TMP Underlay gives the right mass
📌 Final Tips Before You Pour
- Always apply over a compatible MR. JO Primer—choose Eco, MVC, LVC, or UPS based on your substrate.
- Mix thoroughly for uniformity. Avoid lumps or unmixed sections.
- For tampable grades, pack and trowel while mix is fresh and workable.
- Respect pot life and curing cycles—especially in fast-setting variants.
📦 Packaging Formats
- Eco Underlay (Flowable): 5 + 2.5 + 12.5 kg
- Eco Underlay (Tampable): 5 + 2.5 + 32.5 kg
- STD, CMR, FLO, TMP: Similar packing in 7.5 kg, 30 kg, and filler packs
Whether you’re constructing a warehouse floor, preparing a chemical bund, or finishing a pharma lab, MR. JO Underlays ensure you start with strength—and finish with finesse.
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