Moisture Vapor Barrier Epoxy | 25 lb Rated 100% Solids MVB

One Stop Epoxy 100% Solids Moisture Vapor Barrier Epoxy is a professional-grade foundation coating engineered to block moisture vapor transmission through concrete slabs. Rated for extreme conditions up to 25 lbs of moisture vapor emission, this product creates a permanent barrier that prevents the most common causes of floor failure: peeling, bubbling, and delamination.

This is not a finish coat or a receiver coat. It is a critical insurance policy used to stabilize concrete before installing a 100% solids epoxy build system.

Why Professionals Use a 25 lb Rated MVB

Concrete is naturally porous and acts like a sponge, releasing moisture vapor for years. When this vapor pressure builds up beneath a standard coating, it physically breaks the bond, leading to total system failure. Our MVB Epoxy solves this by penetrating deep into the concrete capillaries to create a structural seal that can handle high hydrostatic pressure.

• Extreme Moisture Resistance: Rated to block up to 25 lbs of vapor transmission—far exceeding standard epoxies.
• Prevents Osmotic Blistering: Stops the bubbles that form when moisture is trapped under the floor.
• Superior Bond Strength: Provides a stabilized, non-porous surface for your next epoxy layer to lock onto.
• Zero VOC Formulation: 100% solids with no odor, making it safe for interior and basement applications.

The Proper System Sequence

To ensure a lifetime bond on slabs with moisture concerns, follow the professional "Step-Up" method:

1. The Barrier: Apply One Stop MVB Epoxy directly to mechanically profiled concrete (CSP 2-3).
2. The Build Coat: Once cured, apply a layer of 100% Solids Self Leveling Epoxy. This acts as your pigmented base or "receiver coat" for flakes.
3. The Finish: Complete the system with a high-performance Polyaspartic or Urethane topcoat.

Mixing and Application Requirements

Pro Tip: Do not broadcast flakes or quartz directly into the MVB. This material must be applied as a continuous, unbroken film to effectively block moisture. Mix for a full 3 minutes to ensure the chemical barrier is fully cross-linked.

• Mix Ratio: 2 Parts A to 1 Part B.
• Mixer: Use a box or cage style mixer at 300 to 450 RPM.
• Coverage: 100 to 150 square feet per gallon depending on porosity.
• Dry Time: 8 to 10 hours at room temperature.

Frequently Asked Questions

Do I need a moisture vapor barrier epoxy?
If moisture is present, unknown, or if you are installing over a slab on grade, this is a necessary preventative step to avoid total coating failure.

How do I know if my concrete has a moisture problem?
Visible signs include efflorescence (white powder) or dark spots. The only certain way is testing, but applying MVB is the safest preventative measure for any slab where the history is unknown.

Can I use this for basement floors?
Yes. Basements are inherently prone to moisture issues. Using this vapor barrier is the best way to ensure your basement epoxy floor never peels or bubbles.

Can I broadcast flakes directly into the MVB?
No. The Moisture Vapor Barrier must be applied as a clean, continuous film to seal the slab. After it cures, you apply a 100% solids epoxy layer to serve as your pigmented receiver coat for flakes.

Is this required for garage floors?
It is highly recommended in humid environments, on older slabs, or if you are a professional installer offering a long-term warranty to your clients.

What happens if I skip this step?
Skipping moisture control on a high-vapor slab leads to osmotic blistering and total system delamination, requiring a costly total replacement.

Can this be used as a finished floor?
No. This is a functional base layer designed to stabilize the slab. It must be covered by a 100% solids epoxy build coat and an appropriate topcoat.

What should I use over this product?
Typically, installers follow this with a 100% solids epoxy (like our Self Leveling or 150 Fast Cure) before moving to their decorative broadcast or topcoat.

How long do I have to wait before applying my next coat?
The material is generally dry to the touch in 8 to 10 hours. You should apply your next coat of epoxy within 24 hours to ensure a strong chemical bond.

What is the mix ratio?
The mix ratio is 2 parts Part A to 1 part Part B. Mix thoroughly with a drill mixer for a full 3 minutes before pouring.