Masterboard Joint Sealant 20 oz. Sausage Tube

Masterboard Joint Sealant is a premium, high-performance flexible sealant and construction adhesive, purpose-built for securing and waterproofing Masterboard panel systems. Designed for both professional flooring installers and DIY homeowners, this advanced sealant eliminates the need for additional tape reinforcement at connection points, delivering a watertight, durable finish on every project.

Formulated as a single-component Silyl Modified Polymer (SMP), Masterboard Joint Sealant provides exceptional adhesion, even in wet or alkaline environments. It’s engineered to seal and bond Masterboard panels, seams, and fastener penetrations, enhancing overall waterproofing, structural integrity, and long-term durability. The product’s superior green strength ensures secure, immediate internal strength while maintaining flexibility to accommodate movement caused by thermal expansion, shock, or vibration.

Key Features:

• High-performance elastic adhesive and sealant for Masterboard panels and shower pans (available in 2025)
• Creates watertight, durable, and flexible connections between Masterboard components
• Compatible and interchangeable with wedi Joint Sealant
• Solvent-free and isocyanate-free for safer indoor use

Ideal for use in bathrooms, wet rooms, shower assemblies, and flooring installations, Masterboard Joint Sealant is the trusted solution for professionals and homeowners seeking reliable, long-lasting waterproof connections in demanding environments.