CEM EPIX MVB-150 Moisture Vapor Barrier Epoxy – 3-Gallon Kit

CEM EPIX MVB-150 Moisture Vapor Barrier Epoxy is a two-component concrete primer designed to reduce moisture vapor transmission beneath approved epoxy and urethane coatings. The 3-gallon kit contains 2 gallons of Part A and 1 gallon of Part B, mixed at a 2:1 ratio by volume. Before application, confirm that the concrete’s moisture conditions and surface preparation meet the manufacturer’s requirements. 

Suitable Applications & Restrictions

CEM EPIX MVB-150 is intended for properly prepared concrete floors where moisture vapor transmission is a concern.

Moisture suitability: Not recommended for surfaces with excessive moisture. Before use, obtain the manufacturer’s required moisture test methods and acceptance limits, and confirm that your concrete meets them.

Confirm surface preparation requirements and compatibility with your planned coating system before application.

Key Benefits

• Moisture vapor control: Designed to reduce moisture vapor transmission through properly prepared concrete.
• Concrete adhesion: Bonds to suitable concrete surfaces where moisture vapor is a concern.
• High-solids formula: Contains 100% solids by weight.
• Base for floor coatings: Serves as a primer beneath approved epoxy and urethane systems.

Product Specifications

Coverage

The technical sheet lists 125–175 square feet per gallon, depending on surface porosity, texture, and application method. Before calculating your order, confirm whether this rate refers to mixed epoxy, the required film thickness, and the number of coats.

Surface Preparation & Application Overview

1. Check concrete moisture. Confirm the required test methods and acceptable results with the manufacturer. MVB-150 is not recommended for surfaces with excessive moisture.
2. Prepare the surface. Follow the manufacturer’s required preparation method and concrete surface profile. Leave the surface clean, dry, and free of contaminants. Confirm the required film thickness and coat count before mixing. 
3. Mix the components separately. Mix Part A and Part B individually before combining them.
4. Measure and combine. Use 2 parts A to 1 part B by volume. Mix for 2–3 minutes with a low-speed drill mixer at 300–450 rpm.
5. Apply immediately. Pour onto the concrete and spread with a flat squeegee or roller. The listed pot life is 20 minutes at 77°F.
6. Keep a wet edge. Spread evenly at the approved application rate and avoid excessive buildup.
7. Apply the next coating. Use a manufacturer-approved topcoat within its specified application window. If that window is missed, obtain the required preparation instructions before proceeding. 

Apply within the listed 50°F–80°F range. Read the current TDS and SDS for both components before use.

Working, Recoating & Traffic Times

Confirm the conditions for these times with the manufacturer; only pot life is explicitly stated at 77°F. Tack-free does not mean ready for traffic or fully cured.

If you miss the recoat window: Confirm the required surface preparation before recoating. Also check the approved application window for your selected topcoat.

Before returning the floor to use: Follow the traffic times for the complete coating system, including any topcoat. Vehicle-traffic and full-cure times are not separately specified in the supplied sheet.

Safety & Storage

• Professional use only: Read the technical data sheet and both components’ safety data sheets before mixing or application. 
• Ventilation: Use only in well-ventilated areas.
• Protective equipment: Avoid skin and eye contact. Wear appropriate gloves and eye protection, and follow each component’s SDS for additional PPE requirements.
• Storage: Store above 40°F and keep out of children’s reach.

Frequently Asked Questions

Can I use MVB-150 on concrete with moisture problems?

MVB-150 is designed to reduce moisture vapor transmission but is not recommended for surfaces with excessive moisture. Confirm the required moisture tests and acceptable results with the manufacturer before use.

Which coatings can go over MVB-150?

MVB-150 is a base for approved epoxy and urethane systems. Check compatibility and the application window for the specific topcoat you plan to use.

Can I mix part of the kit?

Confirm that partial-kit mixing is permitted. The specified ratio is 2 parts A to 1 part B by volume. Follow the manufacturer’s partial-batch instructions and measure accurately.

Can I leave MVB-150 exposed as the finished floor?

MVB-150 is described as a primer beneath coating systems. The supplied sheet does not confirm use as a finished floor. Obtain manufacturer approval before leaving it without a topcoat.