Flex Seal Flex Tape Rubberized Waterproof Tape 4" x 5' Gray

The original super-strong, rubberized repair tape designed to patch, bond, seal and repair virtually anything. Its thick, flexible rubber backing instantly stops leaks—even under water—creating a durable, watertight barrier. Unlike ordinary tapes, Flex Tape’s bond grows stronger with time and pressure, making it the go-to solution for fast, lasting fixes.

Whether you’re sealing a roof leak, patching a boat hull, repairing outdoor gear or tackling DIY projects around the house, this gray waterproof tape delivers reliable performance in extreme conditions. It conforms to any shape or surface and can be applied hot or cold, wet or dry—perfect for home, marine, automotive, industrial and camping applications.

Key Features

• Thick, flexible, rubberized adhesive backing
• Instantly seals out water, air and moisture
• Can be applied hot or cold, wet or dry—even underwater
• Withstands temperatures from –70 °F to 200 °F and harsh weather
• UV resistant to prevent cracking and fading
• Environmentally friendly, VOC-free formulation
• Dimensions: 4 inches wide by 5 feet long