About Flex Seal

Designed by Phil Swift and a product of Swift Response, LLC, Flex Seal is an aerosol spray containing a liquid rubber sealant that promises to seep into cracks, and to prevent leakage. The makers of Flex Seal claim that it will last for years without cracking, peeling, or losing any of its sealing properties, whether from summer heat or winter cold.

See Also: Beware: Not Following These 6 Tips Could Cost You Money on Your Next “As Seen on TV” Purchase

The company claims that Flex Seal can be used on gutters, roofs, pipes, window trim, cement driveways, AC drip pans, ductwork, and more, though it is not intended to protect against extreme wind or water pressure. As with most “As Seen on TV” products, Flex Seal comes with a 100% satisfaction guarantee.

How Flex Seal Works

Before using Flex Seal, you should shake the can well, clean and dry your surface, and spray in smooth, sweeping motions approximately 12-14 inches from the contact point. The company recommends that several thin coats be applied to an area larger than where the leak occurred, and that temperatures should be higher than 60°F.

When you’re ready to apply Flex Seal, simply press gently on the nozzle, at which point a thick, rubberized liquid will shoot out, which will seep into cracks and holes. Over the course of 24 hours, depending on temperature, humidity, and thickness, this liquid will dry and become a watertight, flexible coating on just about any surface, which will continue to strengthen over time. After using Flex Seal, the can should be inverted and sprayed in order to clear the nozzle.

Flex Seal comes in three color versions: Original black formula, the light “Brite” color, and the new clear version. While all three versions can be painted over after drying, the clear version has a slightly modified formula, which may require additional applications is order to get the job done.

Flex Seal Pricing, Shipping, & Return Policy

One large can of Flex Seal currently costs $19.99, plus $9.95 shipping and handling. Along with your order, you’ll also receive a second large can as an added bonus, though you’ll need to pay an addition $9.95 for “shipping and handling,” which is where many of these “As Seen on TV” products really make their money. After ordering, your shipment should arrive within 2-4 weeks.

If you’re unhappy with Flex Seal for any reason, you’ll have up to 30 days to return the unused portion, minus shipping and handling costs. To initiate a refund, simply call 800-307-6201 to obtain an RMA. Once the product is received and inspected, your credit card will be quickly refunded.

Pros:

  • Rubberized coating claims to seal any leak, crack, or hole.
  • Fairly inexpensive when compared to other major solutions.
  • Portable, easy to use, and not messy.
  • Dries in 24 hours.

Cons:

  • Flex Seal is an “As Seen on TV” product, which often do not live up to your initial expecations.
  • Numerous complaints that the coating breaks off and peels after a very short period of time, or that it doesn’t work as promised. Some have even claimed to have used two cans and still experienced leakage.
  • Similar solutions can be purchased at your local hardware store for as little as $5, without hassles or shipping and handling charges.

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22 Customer Reviews for Flex Seal

Average Customer Rating: 1.8
Rating Snapshot:
5 stars: 3 4 stars: 1 3 stars: 0 2 stars: 3 1 stars: 15
Bottom Line: 23% would recommend it to a friend
Showing 1-11 of 22
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  • 2 out 2 people found this review helpful

    Don't use it with duct tape!

    • Denver, CO,
    • Feb 13, 2017

    I sealed the leaks in the 6-mil black plastic "floor" of my crawlspace with white Gorilla brand duct tape prior to building a properly elevated floor over it. Then I heard about Flex Seal and thought I'd give it a try. I ordered some online. It was pretty expensive, but I wanted to give it a try.

    I liked that it comes in colors, so I could more easily see where I'd sprayed. I chose Terra Cotta only because it wasn't black or white. I never thought of Terra Cotta as being bright orange, but I didn't care. It wasn't black. It wasn't white. It sprayed on well.

    One can wasn't nearly enough to cover what I had taped (to my surprise). A typical can of spray paint, which is much smaller, would have covered 2-3 times the area. I looked it up again, and a Lowe's near me had it, (though not, sadly, Terra Cotta). Lowe's only had black, white, and, for another $2, clear. I bought two more cans.

    It actively bubbles when first applied. I felt this was an indicator that it was scurrying under and into the small gaps left by the duct tape. It was, in fact, doing just that. Then over the next hour, it ate all the adhesive on the Gorilla tape, and, over the next 24 hours or so, shrank it, as now the tape is all buckled and lifted, and I get to remove everything, buy more tape, and start over, this time WITHOUT Flex Seal. I don't trust it to go through the rips in the floor and onto the dirt, and properly seal without duct tape doing the main work. Maybe I'll use green duct tape this time.

    In fairness, where it was on the plastic, and not touching the tape, it seemed to provide a solid surface, rough about like a sponge, so if I wanted to seal undamaged plastic, it would probably work OK. Coupled with its high cost and low coverage, I'm done with it.

    Bottom Line: No, I would not recommend this to a friend

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  • 1 out 1 people found this review helpful

    Junk

    • Massachusetts,
    • Feb 13, 2017

    I have spent a ton of time restoring a classic boat and thought it would be nice to use this stuff in all of my in deck's fix boxes and storage. Three days after applying, it's already peeling.

    Bottom Line: No, I would not recommend this to a friend

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  • 2 out 11 people found this review helpful

    Hurts

    Got it in my eyes, and a very bad infection and depression followed. Thank you for everything.

    Bottom Line: No, I would not recommend this to a friend

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  • 8 out 11 people found this review helpful

    Rip off

    We got ripped off just trying to order. We put credit card information in. One can and shipping was $29.99, then it automatically added 2 cans of sealer, that we COULDN'T remove from our order. That jumped the total to $89.99. We CANCELED THE ORDER. Never completed it. Then, get notification of a "Thank you for our order." We never placed it!

    We called immediately and they said we have no record of your order, even when we gave the order number. Shortly after we were off the phone the money was charged to the card. This was completely illegal. We couldn't delete card info, we NEVER processed the order, but was charged $90.00. Then lied to from customer service saying no order was received.

    Beware! They rip you off if you change your mind, they add items to your order that can't be removed. Stay away. We are still calling trying to get a hold of someone to get a full refund.

    Bottom Line: No, I would not recommend this to a friend

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  • 15 out 17 people found this review helpful

    My husband put it on the boat

    • Florida,
    • Nov 1, 2016

    So my husband bought a gallon of Flex Seal because it's supposed to be the best. Well, I think not. He put it on the boat yesterday and today we are out on the water and he docks the boat, gets out and sees it peeling off the bottom already. What a waste of almost 90 bucks. I have a picture of it too.

    Bottom Line: No, I would not recommend this to a friend

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  • 17 out 18 people found this review helpful

    Worthless outdoors

    • Detroit, MI,
    • Sep 14, 2016

    I was a professional roofer and came across a customer who used it to seal his skylights. It worked at first, then the leaks came back. When we arrived, the material had dried out and cracked after being exposed to the sun for a very short period. It was dry and dusty like chalk. I have no respect for the people who promote this product.

    Bottom Line: No, I would not recommend this to a friend

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  • 16 out 16 people found this review helpful

    Scam product

    • British Columbia, Canada,
    • Aug 27, 2016

    I tried it on roof of motor home, simply would not work. Full of cracks within one week. I would not recommend. It's really is not even a one star.

    Bottom Line: No, I would not recommend this to a friend

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  • 5 out 11 people found this review helpful

    Good stuff for the right job.

    I have purchased the spray can and the pint paint can. Both worked just fine for the jobs I had.

    Shingles on the roof torn off by tree limbs. After removing the tree limbs, I sprayed the canned Flex Seal on the shingle below the broken one and pressed the broken shingle onto the sealant. Then I sprayed the entire area. Worked great.

    My dogs located some tools with plastic and wooden handles chewing them into splinters. After smoothing out the harsh places, I dipped the handles into the can of Flex Seal. Awesome finish and a non-slip grip.

    We had a shower caddie that was rusting and the plastic coating coming off. I cleaned the caddie making sure all the old soap was washed off. After letting it dry completely, I brushed on the Flex Seal from the can. The spray would have been better but I had loaned it to a friend to fix his motorcycle saddle bags. After 3 coats, the caddie is going into my shop to hold tools and other small items.

    My buddy with the motorcycle saddle bag problem used the spray can to touch up an area on the bottom outside where the bag had some "skidding" damage. The textured area where it was repaired accents the glossy paint of the bag. He was so happy he is going to do the entire bottom of both bags.

    Bottom Line: Yes, I would recommend this to a friend

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  • 15 out 16 people found this review helpful

    Flex Seal

    Would give a minus 10 if possible. Don't order from the website. Processing fees are a scam. Buy at Lowes or amazon.

    Customer service doesn't respond until your order has shipped. Then if you return order, you are responsible for processing fees and original shipping, plus your return shipping cost.

    Bottom Line: No, I would not recommend this to a friend

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  • 11 out 11 people found this review helpful

    Don't waste your money

    I have an older tent trailer that really isn't used anymore. Last time was 2 years ago. It was beginning to leak near the corner seams. I followed the directions correctly and applied the sealant. The trailer has not been moved and the sealant cracked and peeled within about 6 months. It was a good idea, just doesn't work.

    Bottom Line: No, I would not recommend this to a friend

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  • 11 out 16 people found this review helpful

    It worked great sealing a leaking crack in a toilet tank.

    A little more than two years ago, a three inch hairline crack developed around one of the mounting bolt holes in my ceramic toilet tank. A replacement tank would have cost over $100 (US). After removing, thoroughly cleaning the inside, and drying the tank, I applied three light coats of Flex Seal to the interior, allowing for the recommended amount of time between coats. I let the tank dry for a full day before reattaching it to the toilet base and filling it with water. Not a single drop of water has leaked since, and the Flex Seal inside the tank is still completely intact. Since then, I have used this product on a number of waterproofing projects (indoor and out) up here in interior Alaska and I believe it has performed better than advertised, given the temperature extremes experienced where I live.

    Bottom Line: Yes, I would recommend this to a friend

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