Laticrete -Vapor Ban Primer W - Moisture Vapor Barrier & Primer (5gal) is a high-performance, water-based, two-in-one solution that acts as both a moisture vapor barrier and a substrate primer, making it the ideal first step for your flooring installation system. Designed for use under self-leveling underlayments and moisture-sensitive flooring materials, this product helps protect your investment by reducing moisture transmission from the slab — up to 100% relative humidity (RH). Formulated with low viscosity and excellent substrate penetration, VAPOR BAN Primer W seals porous concrete surfaces and reduces the risk of flooring failures caused by excess moisture or poor adhesion. It's an essential product for installers and contractors working in areas with high RH readings or fast-track construction schedules.

• Moisture Vapor Barrier + Primer in One – Streamline your prep with a single product

• Reduces Moisture Transmission – Suitable for slabs with up to 100% RH (ASTM F2170)

• Enhances Bond Strength – Improves adhesion of self-leveling compounds and other flooring materials.

• Low VOC & Water-Based Formula – Contributes to healthier indoor air quality

• Fast-Drying & Ready for Self-Leveling – Can typically be topped in 4 to 6 hours

• Easy to Apply – Roller or squeegee application; great workability and coverage

• Ideal for Renovation or New Construction – Use over concrete in commercial, residential, and institutional settings.