Flex Seal Liquid: Flexible Rubber Coating Sealant for Waterproof, UV-Resistant Protection

Overview

Flex Seal Liquid is liquid rubber in a can that lets you brush, roll, dip, or pour on a continuous, flexible coating. When applied, it creates a watertight seal that keeps out water, air, and moisture while staying breathable and pliable over time.

Flexible protection you can count on

The coating moves with the surface, reducing the likelihood of cracks as conditions change. It features UV resistance to help shield outdoor applications from sun exposure, and it also offers rust and corrosion resistance, making it suitable for exterior, roof, and marine projects.

Key benefits at a glance

• Flexible, rubberized seal that moves with surfaces
• Waterproof barrier blocks leaks in roofs and foundations
• Breathable film that allows moisture to escape while keeping water out
• UV resistant finish for outdoor durability
• Chemical resistant and protective against rust and corrosion

Where to use Flex Seal Liquid

From attic roofs to damp basements, and from RVs and campers to boats and decks, Flex Seal Liquid offers a versatile solution. It’s compatible with EPDM rubber, masonry, and many common exterior surfaces, delivering a uniform coat that dries into a seamless film.

• Roof repairs, leaks around flashing, and vent penetrations
• Sealing gutters and outdoor joints
• Waterproofing basements, crawl spaces, and masonry walls
• Marine and RV applications for flexible, weather-ready protection

How to apply

Prepare the surface by cleaning and drying. Apply evenly using a brush, roller, dip, or pour for a continuous, uniform coat. Allow sufficient cure time and recoat if needed for a durable, pliable film.

Real-world scenarios

Think of small roof patches, leaks around vents, outdoor furniture, sheds, boat hulls, and more. The product dries to a matte black finish that remains flexible and breathable, reducing the risk of cracking under temperature shifts.

• Patch a cracked roof seam during a rainy season
• Seal leaky foundation cracks or masonry joints
• Protect RV seams and marine hardware against moisture
• Coat damp basements to deter moisture intrusion

What to expect after application

When cured, Flex Seal Liquid forms a smooth, continuous film that remains pliable and breathable, allowing vapor to escape while blocking liquid water. Depending on the surface, you may notice a slight gloss that darkens as it cures.