Liquid Rubber Waterproof Sealant – 2.5 Gal – Flexible Roof & Foundation Membrane (Black)

Overview

Liquid Rubber Waterproof Sealant delivers a seamless, rubberized membrane designed to guard flat and low-slope roofs, foundations, gutters, and other moisture-prone surfaces. Built on an industrial-strength bitumen-inspired concept, this water-based coating creates a durable barrier where other sealants may falter, offering a robust option for both DIY projects and professional work. The signature black finish provides a consistent, low-profile look while performing under varying weather conditions.

Key benefits

• Extreme flexibility with over 950% elongation, allowing the coating to move with the building and temperature shifts without cracking or peeling.
• Water-based, low-odor formula with no VOCs, suitable for indoor and outdoor use and safe for sensitive surroundings.
• Strong adhesion to metal, concrete, wood, and more, enabling a versatile waterproofing layer across multiple substrates.
• Professional coverage options can be brushed, rolled, or sprayed; flat/low-slope roofs: about 15 sq ft per gallon per coat, with 3–4 heavy coats achieving 60–80 mil; vertical surfaces: about 30 sq ft per gallon, 2–3 heavy coats for ~30 mil.
• Engineered system pairs with Liquid Rubber Seam Tape or Geo-Textile to bridge joints, seams, vents, and protrusions where movement occurs, for a comprehensive approach to leak prevention.
• Used by pros and DIYers alike, with millions of gallons sold, delivering consistent results from roof repairs to basement waterproofing.
• Premium adhesion to metal, concrete, wood, and more; the coating can remain tacky after curing, so it is not intended for walking surfaces.

Application guidelines and what to expect

• Apply by brush, roller, or spray to create a uniform, flexible membrane that adheres to a variety of substrates.
• Ideal for confined spaces thanks to its low odor and absence of harsh solvents.
• When used as part of a system with seam tape or geo-textile, it helps bridge joints and seams where movement may occur.
• Color is black, providing a durable, low-reflectivity surface that blends with many roof and foundation designs.

In practice, this coating supports moisture protection for flat roofs, foundations, gutters, and other vulnerable areas. Results will depend on proper surface preparation, coat layering, and system compatibility. Consider it a flexible, long-term option to reduce water intrusion while maintaining a clean, professional look.