Verify

Product Information

Flex Paste® Flood Protection, Flex Seal® Spray Flood Protection, Flex Seal Liquid® Flood Protection, and Flex Tape® Flood Protection are part of The Flex Seal Family of Flood Protection Products—an innovative line of products specifically designed to work together to create multiple layers of super-strong waterproof protection that can help seal out floodwaters and be easily removed after water recedes.

Flex Paste® Flood Protection

Flex Paste® Flood Protection starts out as a thick paste and dries to a strong, watertight, removable rubberized coating. It instantly fills gaps, cracks and holes and penetrates deep into hard-to-reach areas, sealing out water, air, and moisture. Flex Paste® Flood Protection is the primary flood protection product and is the base coat for the first layer of protection.

Flex Paste® Flood Protection and is excellent for sealing: holes and gaps, door thresholds, sliding door tracks, garage door seams, windowsills, seams, door jams, casings, window seams, vents, ducts, and more.

Flex Seal® Spray Flood Protection

This thick liquid spray seeps into gaps, cracks, and holes, and then dries to a watertight, removable, rubberized coating—sealing out water, air, and moisture. It is able to coat hard-to-reach areas and seal small openings that may not be visible.

Flex Seal® Spray Flood Protection and is exceptional for sealing: small openings, seams, joints, windowsills, door jams, corners, and more.

Flex Seal Liquid® Flood Protection

It starts out as a liquid and dries to a watertight, rubberized coating—sealing out water, air and moisture. It can be brushed, rolled or poured into areas that need to be sealed and is self-leveling, so gravity will pull it into hard-to-reach areas. Also, it can be applied directly over our other flood protection products as a final layer of protection to help seal openings that may not be visible.

Flex Seal Liquid® Flood Protection and is excellent for sealing: door thresholds, sliding door tracks, windowsills, door jams, casings, corners, and more.

Flex Tape® Flood Protection

Flex Tape® Flood Protection has a powerful adhesive with a thick, flexible rubberized backing that conforms to virtually any shape and surface to create a watertight, flexible barrier.

Flex Tape® Flood Protection is excellent for sealing: window seams, door seams, garage door seams, vents, ducts, and other openings (small and large).

* This information was provided by Flex Seal Family of Products (Swift Response, LLC) and may contain additional information outside the scope of this Claim Verification.

Applicable To:

Flex Paste Flood Protection, Flex Paste Flood Protection & Flex Seal Liquid Flood Protection Combination, Flex Paste Flood Protection & Flex Seal Flood Protection Spray Combination, Flex Paste Flood Protection & Flex Tape Flood Protection Combination, Flex Paste Flood Protection, Flex Tape Flood Protection & Flex Seal Liquid Flood Protection Combination, Flex Seal Flood Protection Spray, Flex Paste Flood Protection & Flex Seal Liquid Flood Protection Combination, Flex Tape Flood Protection & Flex Seal Liquid Flood Protection Combination, Flex Tape Flood Protection & Flex Paste Flood Protection Combination, Flex Tape Flood Protection Butt Joint & Flex Paste Flood Protection Combination

Marketing Claim Verified by UL Solutions

No Water Penetration through 1/2” gaps at depths up to 3 feet, for 14 days

Verification Method

Products were applied to “L” shaped gaps to simulate a corner gap. Each “L” shaped gap had an 18” vertical and a 10” horizontal long gap. ½” gap widths were tested on painted substrates. A fixture capable of holding 36” inches of simulated flood water from the bottom edge of each “L” shaped gap was used for the testing. The testing was conducted for 14 days while monitoring for leaks. All products were applied per the manufacturer’s instructions.

About the Company

Swift Response, AKA the Flex Seal® Family of Products, is an industry leader in providing a variety of DIY home repair, maintenance, and flood protection products with an emphasis on waterproofing, adhesive, bonding and sealing. To find out more visit https://www.flexsealproducts.com

What is UL Verification?

UL Verification is an objective, science-based assessment that confirms the accuracy of marketing claims. Our independent assessment process scrutinizes the validity of specific advertising or promotional statements, giving you a way to separate verified fact from fiction.

Links

Learn more about Flex Seal Family of Products (Swift Response, LLC)

Sealant Tapes, Sprays, Paste, and Liquids

Flex Seal Family of Products (Swift Response, LLC)

V114667

July 12, 2022 - November 30, 2025