Flex Seal Home Depot, Lowes, Walmart: Black Rubber Sealant

Flex Seal is a liquid sealant, and it is specially formulated for easy spraying, rolling or brushing. Its even available as Flex Seal tape.

You can find it at Lowes, Home Depot, Walmart and many home improvement and hardware stores. You’ve probably even seen it at Walgreens and CVS.

Its liquid form makes it easy to seep into holes and cracks to seal them. 

But Does Flex Seal work?

This water proof impervious to the weather rubber can be used to fill in leaks and protects the element from corrosion.  Dry time depends on the temperature, humidity and thickness of the coating. It will usually dry to the touch within 2 to 3 hours and in 24 hours fully cure.

This product has been advertised in the infomercial on television where they replaced the bottom of a boat with a screen and layered the screen with flex seal.

Lowes has Flex Seal in liquid and spray containers.  Home Depot carries Rustoleum brand of Flex Seal called Leak Seal. You can also find Flex Seal at Ace Hardware, Wal Mart and online at Amazon.


Flex Seal is available in Black, BRITE, Clear, Red, Yellow, Terra Cotta, Blue, Green, Almond, Brown, Silver, and White. Flex Seal can be painted any color after it dries.  It will adhere to most any surface such as wood, metal, tile, concrete, masonry, fabric, glass, plastic, aluminum, porcelain, dry wall, rubber, cement and vinyl.

Flex Seal is not recommended for any application with drinking water, extreme heat or pressure, gasoline or any combustible material. Use only in a well-ventilated area. Prevent vapor buildup by opening doors and windows. Ensure fresh air entry during application and drying. Do not use near heat, sparks, pilot lights or other sources of ignition.

Flex Seal Claims:

Easy To Use, Portable, Aerosol Spray
Seeps Into Cracks And Holes
Seals Out Water, Lasts For Years
Stays Flexible And Pliable
Will Not Sag Or Drip In Summer Heat
Will Not Crack Or Peel In Winter Cold
Stops Vibrations And Deadens Noise
Protects Surface From Corrosion
Brush, Roll, Dip or Pour
Apply On Wet Or Dry Surfaces

It has mostly positive reviews.  However, it’s not a solution for serious repair issues.  If you need to seal a leaky flower pot or bowl, it works fine.  Many people have used flex seal on gutters and driveway cracks with pretty good results.

Plasti Dip Rubber Coatings

Different versions of rubber coatings have been around for decades. Most notably, Plasti Dip,  used to coat the handles of wrenches, pliers, hammers and other hand tools. Plasti Dip International  has been manufacturing specialty coatings and adhesives since 1972. The air-dry rubber coating began as a grip solution for tool handles and is popular among DIY crafters, handymen and automotive enthusiasts. So, yes it does have its uses.

ConsumerReports.org tested Flex Seal’s waterproof abilities. They sprayed the product on a screen attached to a miniature rowboat and placed the boat in water and it successfully kept water out of the boat. When ConsumerReports used Flex Seal on holes drilled into copper pipes, the product performed poorly as water gushed through sealed holes. The product successfully sealed a cracked flower pot, but the area needed spray painting to conceal a messy repair.

An Amazon reviewer used the product to repair the aluminum flashing around his chimney and reported no leaks after two years. Alternatively, another Amazon reviewer applied it on his home gutters twice, and the product failed to stop the leaking.

From The Manufacturer:

A patent pending, proprietary formulation that starts out as a thick liquid and dries to a super-strong, flexible, watertight, rubberized coating. Can be brushed, rolled, dipped or poured to create a high-performance protective rubber barrier that blocks out air, water and moisture on a variety of surfaces and objects.

Once cured, it forms a durable, breathable, weatherproof, non-slip barrier that’s resistant to rain, snow, sun, wind, hail, air, moisture, UV degradation, extreme temperatures and natural weathering.

Another Amazon reviewer used two cans of Flex Seal on a concrete fish pond and had great results. A CBS Pittsburgh reporter had a professional carpenter conduct several tests using Flex Seal and found that the drying times are much longer than claimed.

Bottom Line Is, Yes It Works…most of the time

Do you have a leaky roof?

Leaking gutter that is destroying the foundation of your home?

Give it a try before calling the handyman that will cost you hundres of dollars. Flex Seal is the much cheaper alternative. Flex Seal is perfect to use for all home repairs and it stops leaks quickly.

Flex Seal Home Depot Prices?  It’s not always in store.  We’ve found the best prices lately at Amazon.

The spray on reviews seem less positive than the liquid Flex Seal.  You can find out more by reading the reviews online at Amazon.

By Victoria Stone