LABPOX MVB FAST | 100% Solids Epoxy Moisture Vapor Barrier

LABPOX MVB FAST is a professional grade, 100% solids epoxy moisture vapor barrier designed to stop moisture before it destroys your floor. This system is engineered to bond to damp concrete slabs with up to 100 percent relative humidity, making it one of the most reliable solutions for moisture control in the industry.

Moisture is the leading cause of epoxy floor failure. This product is designed to eliminate that risk and provide a stable foundation for epoxy, polyaspartic, and urethane flooring systems.

If you are installing over a slab with unknown moisture conditions, this is not optional. This is your insurance policy.

Performance and Moisture Control

• Up to 100% RH: Bonds directly to damp concrete and new concrete slabs less than 28 days old.
• Permeance: Less than 0.1 perm at 16 mils for maximum vapor protection.
• Moisture Reduction: Reduces emission rates from 25 lbs to less than 3 lbs per 1000 sq ft.
• Pinhole Mitigation Technology: Formulated to reduce surface defects and bubbles by up to 98 percent.

Surface Preparation Requirements

Proper preparation is mandatory. This product solves moisture problems, not surface contamination issues.

• Mechanical Preparation: Surface must be mechanically ground or shot blasted to a minimum CSP-2 or CSP-3 profile.
• Fiber Reinforced Concrete: All surface fibers must be completely removed by burning or grinding. Fibers act as conduits for moisture and will compromise the barrier if not fully encapsulated.
• Clean Surface: Concrete must be free of grease, oil, paint, or curing agents. Use a moisture meter to evaluate slab conditions. While this product bonds to high RH slabs, the surface must be free of standing moisture at the time of application.
• Radiant Heat: If a heated floor is installed, turn the system off 2 to 4 hours before application and keep it off for the duration of the cure.

Mixing Instructions

Proper mixing is critical to ensure the chemical properties of the moisture barrier activate correctly.

• Pre Mix Part A: Mix Part A at low speed before combining to ensure all pigments and solids are fully suspended.
• Mix Ratio: Combine 2 parts Part A with 1 part Part B in a clean container.
• Mix Time & Technique: Mix for 3 minutes using a Box Mixer and a low speed drill at 300 - 450 RPM.
• Immediate Placement: Once mixed, the material must be immediately poured onto the floor in ribbons. Leaving it in the pail will cause an exothermic reaction, making the product unusable.

Application

Apply using a 3/16 inch notch squeegee and back roll with an 18 inch roller to achieve a uniform film thickness. Work the material into the pores of the concrete to ensure full penetration. A minimum thickness of 16 to 18 mils is required to meet the permeance ratings for moisture mitigation.

PRO TIP: This is a fast moving product. Once Part A and Part B are mixed, begin application immediately. Do not allow material to sit in the bucket. Extended dwell time will shorten working time and can lead to poor flow and inconsistent results.

Coverage Rates and Permeance

The vapor barrier performance of this product is directly proportional to the thickness of the coating. To ensure the permeance rating and performance of the barrier, Labsurface recommends a uniform film thickness of 16 to 18 mils.

Frequently Asked Questions

Can I broadcast vinyl flakes or other aggregates directly into MVB FAST?
No. Broadcasting flakes or other aggregates directly into the moisture vapor barrier will decrease the moisture vapor resistance by as much as 75 percent. MVB FAST is a dedicated mitigation layer and must be applied as a standalone film at a uniform thickness to maintain its perm rating. You must apply a separate receiver coat over the barrier before broadcasting flakes.

Do I really need a moisture vapor barrier?
If you are unsure of the moisture levels in your slab, the answer is yes. Moisture is the leading cause of coating failure. Using MVB FAST is your insurance policy against delamination.

Can this be applied to damp concrete?
Yes. This product is designed to bond to concrete slabs with up to 100 percent relative humidity, provided the slab is completely dry to the touch at the time of installation.

What happens if I have fiber reinforced concrete?
Fibers can act as conduits for moisture to travel through your coating. You must burn or grind away all surface fibers and ensure a minimum 16 mil thickness to fully encapsulate them.

How fast can I continue my flooring system?
MVB FAST is engineered for speed. You can typically recoat in as little as 3 to 4 hours, allowing you to install a full system in a single day.

What causes fisheyes or bubbling in the vapor barrier?
Most issues are caused by surface contaminants or air movement. Ensure all HVAC vents are directed away from the floor and turn off all fans to prevent the material from skinning over prematurely.

Can I use this over new concrete?
Yes. This product can be applied to new concrete slabs that have been installed within 28 days, provided the surface humidity is controlled for at least three hours prior to installation.

Why is reverse mixing recommended?
Switching your mixer to reverse mode after 90 seconds forces the liquid from the bottom of the can to the top. This ensures a 100 percent homogeneous mixture which is critical for moisture mitigation.

What is the maximum moisture reduction rate?
When applied at the correct thickness, it reduces moisture emission rates from 25 lbs down to less than 3 lbs per 1000 square feet over 24 hours.

Do I have to sand before applying my next coat?
If you apply the next layer within the 24 hour recoat window, no sanding is required. After 24 hours, you must sand the surface to a dull finish to ensure a mechanical bond.

Does this stop hydrostatic pressure?
Very high levels of humidity may indicate hydrostatic pressure from a drainage failure or water leak. While MVB FAST is a powerful barrier, the source of any major water leaks should be addressed before installation.