Flex Seal

Flex Seal is a family of sealants, tapes and adhesives for homeowners tackling leaks and bonding repairs. Flex Tape gives you a waterproof tape option, while spray and tape have different application temperature ranges. Match the product to the repair and the surface you’re working on.

Swift Response, LLC is the family-owned company behind Flex Seal. The company is headquartered in Weston, Florida. The brand became known through television advertising showing a boat hull cut in two, repaired with Flex Tape and sailed on a lake.

Choose by the repair

Flex Tape is waterproof, and sound material underneath gives its adhesive a dependable place to hold. Peeling paint becomes the weak link in a patch. Remove loose dirt, peeling finish and anything else that could come away with the repair, then press the tape firmly across the whole patch, including the edges.

For Flex Seal Spray, mask nearby finished surfaces before spraying and follow the can’s application and cure directions. Flex Seal Liquid is also part of the family.

Flex Glue is the family’s general-purpose adhesive for bonding parts. For a repair that calls for caulk on a wet surface, Flex Caulk Hybrid allows wet-surface application and has an application temperature range of 0°F to 150°F.

Surface temperature comes first

Flex Tape is best applied at surface temperatures from 20°F to 120°F. Flex Seal Spray can be applied from 0°F to 100°F. That gives the spray a lower application threshold.

A repair surface at 16°F, the Flathead Valley’s average winter low, falls below Flex Tape’s best application range and within Flex Seal Spray’s application range. Measure the actual repair surface before choosing between them.

Application temperature governs when you put the product down; the withstand range describes the temperatures it can tolerate afterward. Use the application range when planning the work, and use the spray’s fully cured range when judging its temperature exposure after curing.

Allow for the conditions

Cold and damp weather may slow curing and affect how Flex Seal products flow or adhere. Leave room in the job for slower curing, and follow the chosen formula’s application and cure directions.

For a Flex Tape repair, the surface beneath the waterproof patch matters over time. Inspect for lifting edges or returning moisture after the joint moves or the area gets wet again.

Temperature specifications

Product	Application surface temperature	Temperature withstand range
Flex Seal Spray	0°F to 100°F	-20°F to 140°F when fully cured
Flex Tape	Best applied from 20°F to 120°F	-70°F to 200°F

Frequently Asked Questions

Does Flex Seal tape work?

Flex Tape is waterproof, but a waterproof patch doesn’t make the surrounding material watertight. Unsealed porous surfaces, including concrete, can still seep water during extended underwater exposure. Finding where the water enters matters as much as covering where it shows up.

How do you use Flex Seal tape?

Give Flex Tape a sound surface to grip by removing loose dirt and peeling finish, then press the whole patch firmly, including its edges. The best application surface temperature is 20°F to 120°F. A patch stuck to loose paint is only attached as well as that paint is.

How do you use Flex Seal spray?

Mask nearby finished surfaces before applying Flex Seal Spray, and follow the can’s directions for application and curing. The surface must be within its application range of 0°F to 100°F. Cold and damp conditions may slow curing, so being within that range doesn’t mean the repair will be ready on the same schedule as a warm, dry job.

How long does Flex Seal tape last?

You can’t turn Flex Tape’s temperature tolerance of -70°F to 200°F into a promise of years of service. A repair’s life also depends on the material underneath and the movement and exposure it faces. Check for lifting edges and returning moisture after the area gets wet or the joint moves.