Flex Seal Liquid - Waterproof Rubber Coating Sealant, Clear, 16 oz | Roof, Basement, RV & Marine Use

A flexible, all-around waterproofing solution

Flex Seal Liquid is liquid rubber in a can, designed to be brushed, rolled, dipped, or poured onto a variety of surfaces. When it dries, it forms a flexible, watertight film that remains breathable and UV resistant. This clear coating is suitable for many outdoor and indoor projects where moisture is a concern without adding heavy, rigid layers.

How it works

The coating goes on smoothly and dries to a clear, flexible film that can expand and contract with the surface as temperatures shift. It seals out water, air, and moisture while remaining breathable enough to minimize trapped condensation in certain environments.

Key surfaces and uses

Use Flex Seal Liquid on roofs, gutters, basements, and exterior walls, as well as on RVs, campers, trailers, and boats. It also works on EPDM rubber, masonry, and various metals where a flexible sealant is helpful:

• Roof seams, flashing, and small leaks
• Basement walls, foundations, and crawlspaces
• Marine surfaces, decks, and outdoor trailers
• EPDM roofing and other rubberized membranes
• Masonry, concrete, and metal surfaces prone to moisture

What you gain from Flex Seal Liquid

Two core benefits to consider are the protective barrier against moisture and the convenience of multiple application methods. The product coats quickly, covering irregular shapes or gaps when brushed, rolled, dipped, or poured.

• Flexible, rubberized coating that seals out water, air, and moisture
• Breathable film that remains flexible with temperature changes
• UV resistance helps protect against sun exposure
• Rust and corrosion resistance on metal surfaces, plus chemical resistance

Note that while Flex Seal Liquid can help address leaks and seepage in many projects, results depend on surface preparation, proper application, and environmental conditions. The clear finish dries to a transparent film, leaving a low-profile appearance on most surfaces.

Simple tips for best results

Prepare the surface, follow drying times, and apply in a well-ventilated area. For best results, apply multiple thin coats rather than a single thick layer on irregular shapes. Always read safety labels before use.