Liquid Rubber Basement & Foundation Repair Sealant — Waterproof Concrete Sealer (5 Gallon, Black)

Overview

Liquid Rubber's Basement and Foundation Repair Sealant offers a flexible, water-based membrane designed to shield concrete structures from moisture. With an impressive 900% elongation, it stays elastic as temperatures shift, helping to reduce leaks and water intrusion over time. If you’re tackling a basement waterproofing project, foundation repair, or related DIY tasks, this sealant provides a resilient, adaptable layer that works as part of a broader system.

As a component of a complete waterproofing approach, this sealant goes beyond ordinary concrete paint or sealants. It forms a durable barrier that adheres to concrete, masonry, wood, metal, and foundation surfaces, while remaining compatible with self-leveling concrete applications where needed. This versatility makes it suitable for a variety of indoor and outdoor projects without needing complex mixing or special tools.

Key benefits

• High elasticity: 900% elongation helps accommodate movement without losing adhesion.
• Strong adhesion: bonds to concrete, masonry, wood, metal, and foundation surfaces for lasting protection.
• Zero VOC, water-based formula: safer for indoor use and easier to cure.
• No mixing required: ready-to-use straight from the can, saving time on site.
• Rubber-based flexibility: remains pliable across temperature changes, reducing the likelihood of future cracking.

Coverage and how to apply

• Interior surfaces: approximately 50 sq ft per gallon per coat; plan 2–3 coats for solid interior protection.
• Exterior surfaces: approximately 20 sq ft per gallon per coat; plan 3–4 coats for outdoor use.
• Recommended conditions: apply between 50°F and 90°F (10–32°C); avoid application on frozen surfaces.
• Application options: brush, roller, or professional sprayer; no mixing required.

Part of a complete waterproofing system

For best results, pair with Liquid Rubber Geo-Textile on joints and transitions, fill small cracks with Liquid Rubber Sealant & Adhesive, and bridge joints, seams, vents, and protrusions where movement may occur. This approach creates a cohesive barrier across key trouble spots.

Notes and guidance

Indoor use can be safe when ventilation is adequate and surfaces are prepared as described. While the membrane provides durable moisture resistance, performance depends on site conditions and proper installation. It’s designed to support, not guarantee, long-term dryness in challenging environments.