GoBoard® Pro Sealant – White Waterproof Tile Backer Sealant & Adhesive 10.3 fl. oz.

GoBoard® Pro Sealant by Johns Manville is a high-performance, moisture-curing hybrid sealant and adhesive engineered for use with GoBoard® tile backer and shower systems. Formulated with silane-terminated polymer technology, it provides strong adhesion to GoBoard® panels and other building materials while remaining permanently flexible. Use GoBoard® Pro Sealant to waterproof joints, corners, and fastener penetrations or to bond GoBoard® panels during installation. VOC-compliant, solvent-free, and low-odor, it’s ideal for both residential and commercial tile projects in San Francisco requiring durable, long-term waterproofing.

Key Features

• 10.3 fl. oz. (304.6 mL) cartridge – White color
• Moisture-curing formula allows same-day tile installation
• Permanently elastic – accommodates up to 25 % joint movement
• Superior adhesion to GoBoard®, wood, concrete, metal, foam, and tile substrates
• Paintable once cured for a clean, professional finish
• No sag – suitable for vertical and horizontal applications
• Skins quickly to speed installation
• Waterproof and weather-resistant – for interior and exterior use
• Non-toxic, solvent-free, and VOC-compliant
• Temperature range: –40 °F to 250 °F (–40 °C to 121 °C)
• Tack-free time: approximately 15 minutes at 77 °F / 50 % RH
• Shelf life: 18 months when stored properly
• Meets ASTM C920 Type S, Grade NS, Class 25 and ANSI A118.10 standards