Flex Seal Liquid, Rubber Coating Sealant, Waterproof

Flex Seal Liquid is a brushable, pourable liquid rubber sealant that creates a flexible, waterproof, UV-resistant coating for repairs and protective coatings.

Designed to form a seamless rubber barrier, this 16 oz can of Flex Seal Liquid applies by brush, roller, dip, or pour to stop leaks, protect surfaces from moisture and corrosion, and add a durable flexible layer over materials like metal, wood, masonry, and EPDM. It dries to a white, breathable finish that resists UV damage and chemical exposure while remaining flexible to accommodate movement and temperature changes.

How do I apply Flex Seal Liquid for fast roof or gutter repairs?

Application is straightforward: clean the surface of loose debris and rust, then brush, roll, or pour the liquid onto the repair area. Work from the edges toward the center for full coverage, and allow adequate drying time between coats if you need added thickness.

• Clean and dry surface; remove loose paint and heavy rust
• Stir can thoroughly before use to mix pigments and solids
• Apply with brush, roller, or pour for seams and flashing
• Wait recommended drying time before adding second coat or exposing to water

Will Flex Seal Liquid bond to different materials like metal, wood, or masonry?

Yes—Flex Seal Liquid adheres to a variety of common substrates including metal, wood, masonry, concrete, and EPDM rubber, providing a watertight flexible membrane. For best results, ensure the surface is sound and free of contaminants to promote solid adhesion.

• Metal and aluminum: removes rust and prime if necessary for longevity
• Wood and plywood: apply to structurally sound, dry wood
• Masonry and concrete: patch large voids first, then coat for moisture protection
• EPDM and rubber: clean with mild detergent and ensure compatibility

How durable is the coating—will it handle sun, moisture, and movement?

Flex Seal Liquid is formulated to be UV resistant and flexible so it withstands sun exposure, thermal expansion, and normal surface movement without cracking. It also provides a protective barrier that slows rust and chemical attack, making it suitable for exterior and marine environments.

• UV resistance reduces discoloration and breakdown from sunlight
• Flexible finish accommodates expansion and contraction
• Breathable formula helps prevent moisture entrapment beneath the coating
• Chemical-resistant properties add corrosion protection

How do I choose the right coverage and maintenance for long-lasting results?

One 16 oz can covers small repairs and touch-ups; estimate coverage based on surface porosity and desired thickness. For larger jobs, plan multiple coats and regular inspections—recoat as needed where wear or abrasion occurs.

• Small patch jobs or seams: 16 oz can provides targeted coverage
• Use additional cans for roofs, large flashing, or continuous seams
• Inspect annually in high-wear areas and reapply where coating thins
• Store unopened cans in a cool, dry place for future touch-ups

Who is this for? Flex Seal Liquid is aimed at homeowners, contractors, RV and boat owners, and DIYers who need a versatile, easy-to-apply waterproof coating for leaks, preventive protection, and small to medium repairs. If you want a brushable or pourable rubberized sealant that bonds to common building materials and resists UV and chemicals, this 16 oz option is a convenient size for targeted fixes and routine maintenance.