Laticrete - Vapor Ban Primer ER - Mini Unit Kit (3Gal) is a specialized, fast-drying primer designed to enhance the adhesion of Laticrete Vapor Ban ER and other moisture vapor barriers to a variety of substrates. This 3-gallon Mini Unit Kit provides the ideal solution for smaller-scale projects that require a reliable bond between the vapor barrier and the surface. Perfect for both residential and commercial applications, Vapor Ban Primer ER ensures a strong, durable foundation for your moisture protection system, helping to prevent flooring failures due to moisture vapor transmission.