Can you spray Flex Seal on concrete?

Author: Zoey Champlin  |  Last update: Wednesday, July 23, 2025

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.

Will Flex Seal adhere to concrete?

Flex Seal can be used on almost every surface: wood, metal, tile, concrete, masonry, fabric, glass, plastic, aluminum, porcelain, drywall, rubber, cement, and vinyl. Plus, it won't sag or drip in the summer heat, and it won't crack or peel in the winter cold. It even prevents corrosion.

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.

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.

EVERYTHING you NEED to Know About FLEX SEAL *How to apply*

How do you remove dried 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 a permanent fix?

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

Does Flex Seal harden when it dries?

Flex Glue is soft when first applied, but it will harden over time. It can be tooled or repositioned within 10 minutes of initial application and will be dry to the touch in 1 hour. In 12-24 hours, Flex Glue dries into a strong, flexible rubber.

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.

Does sealing concrete make it last longer?

Wear-and-tear reduction. Concrete is incredibly durable, but if it isn't sealed properly, it can chip or show wear in certain situations. A quality, professionally installed sealant reduces wear and tear, thereby extending the life of your concrete driveway. UV protection.

Can concrete flex without cracking?

Concrete is not known for its ability to bend, but as this experimental example shows, special formulations of the material can be both flexible and strong. The key is not to prevent cracks completely, but to allow the formation of distributed microcracks that can continue to bear an increasing load.

Can you use liquid rubber on a concrete driveway?

Sealing concrete surfaces with liquid rubber sealant is an effective and long-lasting solution that provides numerous benefits, including waterproof protection, resistance to chemicals and UV rays, and flexibility to prevent cracks and damage.

How do you seal exterior concrete?

Here's a step-by-step summary of how to seal concrete:
  1. Remove all oil, grease, stains, dirt, and dust from the concrete.
  2. Strip any existing sealer from the surface.
  3. Open up the concrete with an etching solution.
  4. Apply a thin coat of sealer using a roller or sprayer.
  5. Wait for the first layer of sealer to dry.

Can I use Flex Seal spray in my shower?

Many people have had success using Flex Seal Aerosol to seal their shower tiles. With that being said, we would not recommend applying Flex Seal on shower floors as Flex Seal may become slippery when wet.

Does Flex Seal stop foundation leaks?

Flex Shot and Flex Seal Liquid are great options for attacking a basement wall leak. Flex Shot includes an easy to use extension tube that makes it easy to get into corners or other tight spots.

Which Flex Seal is best for concrete?

Flex Seal Liquid is optimal for sealing, repairing, and weatherizing concrete. It works by sealing out air, water, and moisture and is mildew, chemical, and UV resistant. You can either brush, roll, dip or pour the liquid directly onto the concrete surface.

Why is my Flex Seal spray still sticky after drying?

If your Flex Seal still feels sticky or tacky after application, it may not be fully cured. Please note that dry times can vary due to temperature, humidity, and thickness of the coat. When applying Flex Seal, we recommend spraying the product 8-12 inches from the surface, using an even sweeping motion.

How thick can I pour Flex Seal?

A: Flex Seal Liquid can be poured to any thickness desired. We recommend pouring in layers 1/4-1/2" thick to ensure the product cures completely. For a normal application Flex Seal Liquid takes 24-48 hours to completely cure.

What is the lifespan of Flex Seal?

Answer. Flex Seal Clear's longevity can vary depending on the conditions and surfaces to which it's applied. Generally, it can last for several years when applied properly and used in environments that don't involve extreme wear and tear.

How much does 1 gallon of Flex Seal cover?

However we have Flex Seal Liquid that comes in Gallons each gallon covers approximately 150 square feet and depending on how thick you roll or pour it you will need 3-5 gallons on your Shop roof.

How many coats of Flex Seal spray do I need?

Apply several coats until the surface has been completely covered and all cracks and holes have been filled. Use a clean, dry cloth to wipe up any spills. Alcohol can be used to wipe residue before it cures.

Can you use Flex Seal spray on cement?

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.

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 do you remove sealer from concrete slab?

In most cases, using a chemical stripper is the easiest and most cost effective way to remove an old sealer from concrete. Chemical strippers are made from alkaline chemicals that dissolves and deconstructs the sealer film, allowing for easy removal from your surface.

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