Flex Seal Liquid rubber sealant coating — White 16 oz, brushable waterproof, flexible UV-resistant

Flex Seal Liquid is a brushable, rollable, pourable liquid rubber sealant that creates a waterproof, flexible white coating for repairs and protection.

Flex Seal Liquid Rubber Sealant Coating in 16 oz (white) is a versatile, water-resistant formula designed to form a seamless rubber barrier on metal, wood, concrete and many other surfaces. It applies like a paint but cures into a flexible membrane that helps block water, air and moisture while resisting UV exposure, rust and many chemicals. The product is formulated for DIYers, builders and maintenance pros who need a fast, adaptable coating to stop leaks, cover seams, and extend the life of outdoor and indoor materials.

How do I apply Flex Seal Liquid for a reliable seal?

Application is straightforward: brush, roll, dip or pour the liquid rubber where you need coverage. Surfaces should be clean and dry for best adhesion; multiple coats build thickness and durability. Allow proper drying time between coats for a uniform membrane.

• Apply with a synthetic-bristle brush, roller, or pour directly into seams and cracks
• Clean and remove loose rust, dirt, grease, and peeling coatings first
• Use at room temperature; stir well before use and between coats
• Recoat after recommended dry time to achieve desired thickness

What surfaces can Flex Seal Liquid be used on?

Flex Seal Liquid bonds to a wide range of building materials including metal, wood, concrete, PVC and fiberglass. It works well for exterior and interior repairs where a water-resistant, flexible finish is required. Some porous surfaces may need a primer or additional coats for full coverage.

• Metal roofing, gutters, flashing and HVAC ducts
• Wood decks, planters and trim that need moisture protection
• Concrete foundations, masonry joints and steps
• Plastic and fiberglass repairs with proper surface prep

How durable is the cured coating and what protections does it offer?

Once cured, Flex Seal Liquid forms a rubberized layer that resists cracking and remains flexible as temperatures change. The formula offers UV resistance and can slow rust and corrosion on treated metal surfaces. It is chemically resistant to many household substances, improving longevity in exposed applications.

• Flexible membrane reduces cracking from thermal movement
• UV resistant to help prevent sun-related breakdown
• Helps protect metal from moisture-driven rust and corrosion
• Chemical resistance suitable for common household exposures

Who is this for? Flex Seal Liquid 16 oz in white is ideal for homeowners, handymen, builders and property managers looking for a simple, multi-surface way to stop leaks and add a protective rubber coating. It’s suited to quick patch jobs, preventive maintenance and finishing details where a water-tight, flexible seal is needed. Choose this product when you want a paint-like application that cures into a resilient rubber barrier for indoors or outdoors.