Concrete Crack Healer and Sealer

October 7, 2025

Fast Crack Healer and Sealer for Concrete Floors

When concrete floors start to show signs of cracking or surface wear, repairing them quickly and effectively can prevent costly downtime. Epoxy.com Product #684LV is a methyl methacrylate (MMA) resin system designed to penetrate, bond, and seal concrete surfaces — not just on bridge decks, but anywhere durable protection is needed.

What Makes #684LV Different

Unlike typical epoxies or sealers, #684LV is ultra-low viscosity and fast-curing. It seeps deep into cracks and pores in the concrete, restoring structural integrity while sealing out moisture and contaminants. Once cured, it forms a clear, tough, chemical-resistant surface that can be top-coated or left exposed.

  • Fast cure: typically 30–45 minutes even at low temperatures.
  • Deep penetration: bonds within the concrete matrix.
  • Chemical resistance: excellent for acids, fuels, and solvents.
  • Low downtime: floors can be reopened to traffic within an hour.

Ideal Uses Beyond Bridge Decks

While #684LV is trusted for infrastructure work, it’s equally effective in:

  • Industrial plants and warehouses – quick repairs between shifts.
  • Food and beverage facilities – sealing cracks to prevent bacterial growth.
  • Retail and commercial floors – keeping polished concrete from spalling.
  • Chemical and wastewater facilities – long-term protection from vapor intrusion.
  • Parking decks and ramps – extending the life of exposed slabs.

Wherever rapid turnaround and strong bonding are required, #684LV is a proven performer.

Application Notes

  1. Prepare the surface by cleaning and drying the concrete thoroughly.
  2. Flood-coat or broom-apply #684LV until refusal — allow penetration.
  3. Optional broadcast: silica sand for slip resistance or mechanical profile.
  4. Reopen to traffic within approximately one hour (temperature dependent).

For severe cracking, the material can also be pressure-injected to restore internal bond.

The Bottom Line

Epoxy.com Product #684LV gives contractors and facility managers a fast, permanent way to stop cracks before they grow — without waiting days for cure time. It’s a simple, reliable solution for extending the life of your concrete floor systems.

For more information contact:

Epoxy.com 
A Division of Epoxy Systems, Inc
A Vermont Corporation 
USA 

We have products that have passed the test of time as well as the best new Systems available today.

Since 1980 – 40 years of the highest quality products

Hours: 9AM-4PM Eastern Time (6AM-1PM Pacific Time)

Closed for lunch from 12Noon to 1PM


321-206-1833  Customer Service – Ordering and Order Status
                         Katey Lambert-Fontaine, VP – Chief Operations Officer
                         sales@epoxy.com

                        Technical Support
352-533-2167  Norm Lambert, President – Technical Support Director 
                         info@epoxy.com

Leave a Comment » | Bonding systems, Bridge Concrete Repair, Concrete Infrastructure Repair, Epoxy, fast setting, Methyl Methacrylate (MMA), MMA Crack Healer and sealer, Winter cure, Winter installation | Tagged: , , , , , , , , , , | Permalink
Posted by Norm Lambert

Prep Your Floor for Epoxy

September 26, 2025

How to Prep Floors, Edges, Corners, and New Concrete Before Installing Epoxy Flooring

When it comes to epoxy flooring, the success of your installation depends on proper surface preparation. Customers often ask: Should I use shot blasting or diamond grinding? How do I handle corners and edges? What about new concrete patches or ramps? Let’s break it down.

Shot Blasting vs. Diamond Grinding

Both shot blasting and diamond grinding are excellent ways to prepare a concrete surface for epoxy coatings.

  • Shot blasting uses steel shot to clean and profile the surface. It creates an aggressive texture and is especially effective for large, open areas.
  • Diamond grinding uses rotating diamond segments to abrade the surface. It leaves a flatter profile and is a good option when you need precision or when shot blasting isn’t practical.

The choice often comes down to the size and condition of the floor. In many cases, contractors will use both methods—shot blasting for the main area, followed by grinding for touch-ups.

What About Corners and Edges?

No blaster or grinder reaches all the way into tight corners and along edges. That’s where hand tools come in.

  • A wood floor edger or hand grinder can handle most edges.
  • For stubborn corners, a scaler (an air hammer fitted with needle-like points) works especially well.
  • In tough spots, even a sharp chisel can help remove weak or unsound concrete.

The good news: corners typically don’t see heavy traffic, so the goal is simply to make them sound and as well-prepared as possible.

Avoid Concrete Patches Under Epoxy

It’s tempting to repair ramps, height transitions, or cracks with regular concrete. But we don’t recommend it. Concrete patches are prone to cracking and loosening over time, creating voids beneath your epoxy system.

This risk is even greater in facilities dealing with chemical vapors—such as former dry-cleaning plants with PERC contamination—because trapped vapors can accelerate deterioration of weak patches.

The Better Solution: Epoxy Mortar

Instead of concrete, we recommend making repairs with an epoxy mortar. Mix Epoxy.com Product #12 Primer with silica sand to form a strong, durable patching compound. This bonds tightly to the existing slab and is fully compatible with your epoxy coating system.

This approach ensures your “ramp” or patch area blends seamlessly with the rest of the coated floor—and stays solid for years to come.

Understanding the 28-Day Rule

A common question is whether epoxy primers can be applied to freshly poured concrete. The answer: not yet.

The 28-day cure time is a requirement of the concrete itself, not the epoxy. The American Concrete Institute (ACI) sets this standard to ensure concrete reaches full strength before coatings are applied.

So, if you’re installing new concrete in part of your floor, coat the existing slab right away, but leave the new section until it has cured for 28 days. Then, come back with the same epoxy primer and coating system. The new section will blend in with the rest of the floor.

Key Takeaways

  • Use shot blasting for aggressive profiling and diamond grinding for precision.
  • Prep corners and edges with hand tools like grinders, scalers, or chisels.
  • Avoid patching with concrete—use an epoxy mortar made from #12 primer and silica sand instead.
  • Follow the 28-day cure rule for new concrete; it’s about the concrete, not the epoxy.

By following these guidelines, you’ll create a strong, continuous epoxy floor that resists chemical attack, handles traffic, and protects your concrete substrate for the long term.

For more detailed information

Contact Us Today:

📞 Call: 321-206-1833 (orders)

📞 Technical Support: 352-533-2167

📧 Email: sales@epoxy.com

🌐 Visit: www.epoxy.com

Leave a Comment » | Epoxy, Epoxy Flooring Preparation, Concrete Surface Prep, Industrial Flooring, Chemical Containment Floors, Dry Cleaner Remediation, How-To Guides | Tagged: , , , , , , , , , , , , | Permalink
Posted by Norm Lambert

Sealing Former Dry Cleaning Facilities

September 19, 2025


With Epoxy.com #12 Primer and #633

Perchloroethylene (PCE) contamination is a common challenge at former dry-cleaning facilities. Even after operations have stopped, residual solvents often remain in the soil and vapor can migrate upward through the concrete slab. Left untreated, this can cause environmental liability, health concerns, and ongoing regulatory issues.

Former PCE Cleaner – Protected by #633

The solution? A properly designed epoxy vapor barrier system installed directly over the existing concrete.

Why PCE Vapor Intrusion Is a Problem

  • Health Risk: PCE vapors can migrate into occupied buildings, posing inhalation hazards.
  • Structural Risk: Solvents may deteriorate floor coverings and adhesives.
  • Regulatory Risk: Many state and federal environmental agencies require mitigation once contamination is identified.

Concrete alone is not an effective barrier. That’s why Epoxy.com Product #12 Primer and Product #633 Coating are the recommended system for sealing these slabs.

Step 1: Surface Preparation

Before installing any vapor barrier epoxy, proper preparation is critical:

  1. Clean and profile the concrete – Use mechanical abrasion (diamond grinding or shot blasting). Avoid acid etching, as it can drive contaminants deeper.
  2. Repair cracks and joints – Fill with an epoxy mortar or flexible joint filler compatible with #12 Primer.
  3. Moisture test – Even if no active leaks are visible, confirm slab conditions. High moisture slabs are acceptable when properly primed with #12.

Step 2: Apply Epoxy.com Product #12 Primer

Product #12 Primer is a penetrating epoxy primer designed for damp or contaminated concrete.

  • Bonds tightly to difficult substrates
  • Seals micro-pores and imperfections
  • Provides a stable base for the topcoat

Apply with a roller or squeegee at the recommended coverage rate. Allow to cure tack-free before proceeding.

Step 3: Apply Epoxy.com Product #633 High-Performance Epoxy

Product #633 is a chemical-resistant epoxy coating ideal for vapor barrier and environmental remediation projects.

  • Resists chlorinated solvents like perchloroethylene
  • Creates a dense, non-permeable film
  • Easy to clean and maintain once cured

For best results, apply two coats of #633 over the cured #12 Primer. This builds a thick, protective membrane that locks down vapor migration and creates a clean, durable surface finish.

Epoxy.com #633 – Former Dry Cleaner

Benefits of the #12 + #633 System

  • Regulatory Compliance: Meets many environmental mitigation standards.
  • Long-Term Durability: Designed for industrial service conditions.
  • Cost Efficiency: Can be applied directly over existing slabs, avoiding costly concrete replacement.
  • Flexibility: Compatible with top finishes such as urethane, tile, or carpet adhesives (with proper testing).
  • Former dry-cleaning plants
  • Commercial buildings with solvent-impacted soil
  • Industrial sites where chlorinated solvents were stored or used

✅ If you’re dealing with perchloroethylene vapor intrusion in a concrete slab, Epoxy.com #12 Primer and #633 are a proven system to stop vapor transmission and restore usable space.

👉 Learn more: Epoxy.com #12 Primer | Epoxy.com #633

Leave a Comment » | Epoxy | Permalink
Posted by Norm Lambert

Industrial Epoxy Protection for Chemical Spill Containment

June 16, 2025

Chemical Containment

Why Wastewater Plants and Chemical Facilities Trust Epoxy.com Product #633

When it comes to chemical spill containment, there’s no room for compromise. Whether you’re working at a municipal wastewater treatment plant or an industrial chemical facility, the floor beneath your feet must withstand aggressive substances—every single day.

Product #633

That’s where Epoxy.com Product #633 comes in.

Engineered for Aggressive Chemical Environments

Product #633 is a high-performance, chemical-resistant coating system specifically formulated to protect concrete and steel surfaces exposed to:

  • Sulfuric acid
  • Sodium hydroxide (caustic soda)
  • Sodium hypochlorite (bleach)
  • Other corrosive or oxidizing agents

It creates a seamless, impermeable barrier ideal for areas like:

  • Chemical storage rooms
  • Battery charging stations
  • Acid neutralization pits
  • Sludge handling areas
  • Secondary containment dikes

Where It Shines: Municipal and Industrial Use Cases

🏭 Municipal Wastewater Treatment

Treatment plants frequently use harsh chemicals in disinfection and sludge treatment processes. These environments demand long-term chemical resistance, moisture tolerance, and reliable adhesion to aged concrete. Product #633 is trusted by municipalities across North America for exactly these reasons.

⚗️ Chemical Manufacturing & Storage

Facilities handling acids, alkalis, and oxidizers require more than just a strong floor—they need long-term protection that prevents leaching and corrosion of substructures. #633 is USDA- and EPA-compliant, making it suitable for regulated environments including food and beverage plants.

Key Benefits of Product #633

✔️ Outstanding resistance to acids, bases, and oxidizers
✔️ Seamless—no joints to trap chemicals or moisture
✔️ Low-odor / Low-VOC formulation
✔️ Bonds to damp surfaces and green concrete
✔️ Compatible with fiberglass mat reinforcement for extreme duty applications

Application Tips

Cross-section of a secondary containment trench coated with Epoxy.com Primer and Product #633.
  • Surface Prep: Clean and profile concrete (mechanical abrasion). Acid etching not required or recommended.
  • Primer: Use Product #12 or Product #899 for normal concrete or Product #201 as an oil stop primer.
  • Topcoat: Apply Product #633 in one or two coats depending on exposure levels.
  • Optional: Reinforce with fiberglass cloth for added chemical impact resistance.

Need help designing your system? Contact our team at Epoxy.com for project-specific recommendations.

Trusted by Specifiers, Engineers, and Operators

Thousands of square feet of Product #633 have been installed across North America in:

  • Pump stations
  • Secondary containment vaults
  • Chlorine and sulfuric acid storage
  • Truck unloading stations
  • Tank farms and refueling points

Looking for a proven solution for your next chemical containment project? Don’t risk using a general-purpose epoxy. Choose a system designed for the chemical environment.

Ready to Protect What Matters?

Contact us today to get help with:

  • Specification documents
  • Samples
  • Custom resin systems for unusual exposures

📞 Call: 352-533-2167
📧 Email: Info@epoxy.com

Leave a Comment » | Chemical Resistance, Chemical Resistant Epoxy, Chemical Resistant Paint, Commercial epoxy flooring, Epoxy, Industrial Epoxy Coatings, Novolac Epoxy, Epoxy Joint Fillers, Safety | Permalink
Posted by Norm Lambert

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