Liquid Rubber Basement & Foundation Repair Sealant — Waterproof Concrete Sealer & Crack Filler (2.5 Gal, Black)

Reliable Waterproofing with Flexible Performance

Liquid Rubber's Basement and Foundation Repair Sealant creates a durable, waterproof membrane that moves with your structure. Its remarkable 900% elongation helps prevent leaks as foundations shift, offering a practical solution for basement walls, foundation leaks, and other water challenges.

This product goes beyond simple paint or basic sealants. It acts as a complete waterproofing system that seals against active leaks and moisture, and it’s compatible with self-leveling concrete applications. Use it to protect interior basements, exterior foundations, and other concrete surfaces where moisture is a concern.

Crack Filler and Substrate Compatibility

The professional-grade rubber coating adheres to concrete, masonry, wood, metal, and more, maintaining flexibility across temperature changes. This makes it a versatile choice for DIY projects where movement and stress are expected.

• Excellent adhesion to multiple substrates for long-lasting protection
• Flexible performance across temperature ranges to reduce re-cracking
• Water-based, zero VOC formula with easy cleanup

Coverage, Application, and System Tips

Interior basement surfaces typically achieve about 50 square feet per gallon per coat, while exterior concrete surfaces yield around 20 square feet per gallon per coat. For full protection, apply 2–3 coats indoors and 3–4 coats outdoors, and pair with Liquid Rubber Geo-Textile on joints and transitions.

• Apply between 50°F and 90°F for best results
• No mixing required; brush, roller, or professional sprayer can be used
• Not recommended for walking surfaces due to tackiness when cured

Usage Guidelines for a Watertight System

Use this water-based sealer as part of a comprehensive waterproofing approach: seal joints with Geo-Textile, fill small cracks with the sealant, and bridge seams where movement may occur. This approach helps create a cohesive, watertight network for indoor and outdoor protection.