Liquid Rubber Basement & Foundation Sealant — Waterproof Concrete Sealer, 5 Gal

Overview

Liquid Rubber Basement and Foundation Repair Sealant delivers a flexible, waterproof membrane designed to protect basement walls, foundations, and adjacent concrete surfaces. This professional-grade coating adapts to movement and varying temperatures, helping to guard against moisture intrusion while remaining easy to apply for DIY projects.

Crafted as a water-based sealant with zero VOCs, it acts as more than a surface coating. When used as part of a complete system, it works with joints, transitions, and critical areas to create a cohesive waterproofing layer that stands up to daily wear.

Why it stands out

• Superior flexibility: exhibits up to 900% elongation, allowing movement without cracking or peeling.
• Long-lasting waterproofing: forms a durable membrane on interior and exterior concrete, masonry, and more.
• Versatile adhesion: adheres to concrete, masonry, wood, metal, and foundation surfaces, making it suitable for a range of projects.
• Low odor and safe indoors: water-based with zero VOCs, no mixing required, and easy brush, roller, or sprayer application.
• Complete system compatibility: designed to pair with Liquid Rubber Geo-Textile on joints and transitions and works well with self-leveling concrete.

Usage guidelines emphasize a coatings-based approach rather than a traditional paint, with interior performance that improves moisture resistance and exterior protection that helps keep surfaces dry under varying conditions. The formula is not intended for use as a walking surface until fully cured, due to tackiness.

How to apply as part of a waterproofing system

• Interior surfaces: coverage is typically about 50 sq ft per gallon per coat; apply 2–3 coats for complete protection, with a recommended temperature range of 50°F–90°F.
• Exterior surfaces: coverage around 20 sq ft per gallon per coat; plan for 3–4 coats for robust waterproofing, with proper surface preparation.
• Application methods: brush, roller, or professional sprayer can be used to build up the membrane evenly.
• System pairing: for best results, use Liquid Rubber Geo-Textile at joints and transitions and supplement with Liquid Rubber Sealant & Adhesive for small cracks.

Real-world uses

• Basement waterproofing and foundation leak repair to reduce dampness on walls.
• Shower liner and other moisture-prone areas where a flexible, resilient coating helps manage movement.
• Planter boxes and other exterior-to-interior transitions where a robust membrane supports moisture barriers.
• DIY projects where a durable, black membrane adds a uniform appearance and protective layer.

Specs at a glance

The sealant is a high-build, water-based coating that cures to a flexible, protective film. It is designed for interior and exterior use, offers strong adhesion to common building substrates, and remains workable within the recommended temperature window. For a full watertight system, pair with the Geo-Textile and other Liquid Rubber components as part of a coordinated approach.