Can you remove Flex Seal from concrete?

Author: Laurie O'Connell  |  Last update: Sunday, September 14, 2025

If the Flex Seal is still wet, it can be removed with a dry cloth or paper towel. If the Flex Seal is cured/dry, it can be removed with acetone, denatured alcohol, or mineral spirits.

What dissolves Flex Seal?

If you need to remove Flex Seal from a surface, you have a few options depending on the type of surface. For metal: Use a damp rag and acetone. For wood, fabric, or carpets: Use mineral spirits. For the body of a vehicle: Use a small amount of toluene.

Does WD-40 remove Flex Seal?

WD40 can be used to aid in the removal of Flex Tape. But the most effective way to remove Flex Tape from surfaces is Flex Adhesive Remover. It's designed for the job.

How long does Flex Seal last on concrete?

Depending on the environment, coats added, and maintenance, many people have found Flex Seal will last for years without cracking, peeling, or losing any of its strength or sealing properties.

Is Flex Seal a permanent solution?

Flex Tape is a temporary, emergency repair and is not meant to be a permanent fix.

How to Remove Flex Seal From Concrete

How to remove Flex Seal from concrete?

If the Flex Seal is still wet, it can be removed with a dry cloth or paper towel. If the Flex Seal is cured/dry, it can be removed with acetone, denatured alcohol, or mineral spirits.

Is Flex Seal hard to remove?

Flex Seal tape is extremely difficult to remove once you've applied it to a surface. This is going to take a fair bit of effort. You'll 100% be able to get the tape up with enough elbow grease, though.

What will Flex Seal not stick to on concrete?

I have used Flex Seal to close up cracks in concrete. However if the surface you apply the Flex Seal to is "granular" and flaking off, the Flex Seal will not stick to it. Keep in mind that Flex Seal is a coating, not a bonding agent.

What should you not use Flex Seal on?

We do not recommend using Flex Seal on foam. Some foams may react poorly with Flex Seal, and may warp or dissolve. We also do not recommend using it in situations where it is subjected to high heat or pressure (such as engine radiators) or gas tanks. We do not recommend the use of Flex Seal spray on vinyl.

What happens if Flex Seal gets wet?

Once dry, Flex Seal's watertight, rubberized coating can withstand water, heavy rains, snow, and more. Flex Seal can be applied to a wet surface or moist environment in the event of an emergency. However, it will always adhere better to a clean, dry surface.

Does Flex Seal wear off?

A: With proper application, care and maintenance, Flex Paste will last for years.

Does paint thinner remove Flex Seal?

As soon as you see the splatter of Flex Seal on your car, put just a little toluene* on it and then rub profusely with a rag. Toluene is essentially a paint thinner. It will take care of any heavy duty projects like cars. Be careful, however, as toluene could result in removal of your car's paint.

Can you smooth out Flex Seal?

Flex Seal sprays out as a thick liquid and dries to a watertight, flexible rubberized coating. For best results, spray Flex Seal about 8-10 inches from the surface, using an even, sweeping motion. If you need to smooth out Flex Seal, you can do so while it is still wet or uncured by using a disposable paintbrush.

What will bond to Flex Seal?

Flex Seal Spray can be top coated with most commercially available paints and urethanes. Flex Glue not only works as a great adhesive but can also be used as a sealer around windows and doors. Flex Glue can be painted over with most commercially available paints and urethanes.

Can Flex Seal be cleaned?

For cleaning purposes, we just recommend using regular soap and water on the surface of the cured Flex Liquid. Alcohol and other minerals will begin to breakdown the product and slowly remove it. Once clean with soap and water you should safely be able to apply the next coat as needed.

How to soften Flex Seal paste?

Once Flex Paste cures, it is not possible to soften the product. When Flex Paste is exposed to air or moisture or humidity it begins to cure, forming a skin within 15 to 30 minutes. It will fully cure in about 24-48 hours depending on temperature and humidity.

Is Flex Seal really waterproof?

Flex Seal floated our boat, and Teddy stayed dry. But with other uses, we hit rough seas. It took three coats of Flex Seal to plug the pipe holes, and larger holes blew out under water pressure. Even three coats didn't seal vertical sections of our gutter's end caps and joints: The product dripped down.

What happens if you paint over Flex Seal Liquid?

Flex Seal Spray can then be painted over with almost all commercially available paints and urethanes. Flex Seal Liquid cannot be top coated with anything other than Flex Seal Liquid, however, you can add as many coats as you like. Just allow Flex Seal Liquid to fully dry between coats.

Can mold grow on Flex Seal?

A: Flex Seal Liquid is mildew resistant.

What can I put on my forms so concrete doesn't stick?

Oil-based: Barrier oil release agents such as linseed, mineral and paraffin create a physical film that prevents the concrete from sticking.

Is Flex Seal good on concrete?

Yes, you can use Flex Seal Spray on concrete. Flex Seal seeps into cracks and holes and dries to a watertight, flexible rubberized coating. Flex Seal can also be used on many other surfaces, including wood, metal, tile, masonry, fabric, glass, plastic, aluminum, porcelain, drywall, rubber, cement, and vinyl.

How permanent is Flex Seal?

Flex Tape is meant to temporarily fix leaks, it is not a permanent fix, more like a band-aid to help stop leaks to give you time to repair them. Flex Tape lasts quite a long time, it really depends on the environment and how much water pressure is happening within the leak.

How long does Flex Seal take to fully cure?

Flex Seal will usually dry to the touch within 2-3 hours of application and fully cure in 24-48 hours. Dry time depends on the temperature, humidity, and thickness of the coating.

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