Liquid Rubber Waterproof Sealant – 1 Quart, Flexible Membrane for Roofs, Foundations & Gutters – Black

Overview

Liquid Rubber Waterproof Sealant is a high performance, water based membrane designed to seal and protect flat and low slope roofs, foundations, gutters, and more. It forms a seamless, flexible barrier that helps resist water intrusion in challenging areas. This coating is designed for both DIY projects and ongoing maintenance, offering a practical alternative to traditional tar or patch products.

Why choose this sealant

• Flexible, durable coating with over 950 percent elongation, maintaining adhesion even as the building moves or temperatures shift.
• Water based with no VOCs and low odor, making indoor use more comfortable and safer for sensitive materials.
• Easy application options including brush, roller or spray; suitable for flat and low slope roofs, as well as vertical surfaces.
• Engineered for a comprehensive waterproofing system when paired with seam tape or geo textiles to bridge joints and protrusions.
• Suitable for professional contractors and ambitious DIYers alike, widely adopted for roof repairs and preventive maintenance.
• Premium adhesion technology to metal, concrete, wood and more; the coating forms a film that can remain tacky enough for subsequent layers, but is not intended for walking surfaces.

Real world usage and expectations

When applied, the coating dries to a matte black film that stays flexible and weather resistant. Coverage varies by surface and coat thickness. For flat or low slope roofs and standing water surfaces, expect roughly 15 sq ft per gallon per coat, with 3 to 4 heavy coats to reach a durable 60 to 80 mil membrane. For vertical surfaces like foundations, about 30 sq ft per gallon with 2 to 3 heavy coats to achieve a 30 mil film. Actual results depend on surface condition, preparation and method.

Usage ideas

• Seal flat roofs and low slope patches to help prevent leaks.
• Protect foundations and basement walls against moisture intrusion.
• Coat gutters, planters, or concrete surfaces to create a continuous waterproof layer.
• Ideal for confined spaces where odor and fumes are a concern thanks to the water based formula.

Note that this product is designed to deliver a flexible protective membrane rather than a rigid patch, and it is not intended for heavy foot traffic. Always follow the label instructions for safety and best results.