Does Flex Seal Really Work?

Does Flex Seal really work?Flex Seal is taking a product that has been around for a long time, and marketing it to the public as an all-in-one fix for many problems around the home. If you watch their promo you will no doubt think of things around your own home that need fixing, and would wonder if this does the trick.

Because things are either too hard for us to fix on our own, or too expensive to have someone else fix for us, they get left undone. This can lead to further problems, especially if something is leaking water and causing water damage. A quick solution to this problem would be great, and so something that sprays on and fixes the problem permanently would be very welcome.

The Claim
Flex Seal is liquid rubber in a can. This means that when you spray it onto a surface, it will make it waterproof, but also remain flexible, like rubber. There are tons of jobs that it can do, from repairing holes in things that are supposed to be waterproof, to cracks and leaks in all sorts of things from tents to gutters.

They say that when you make a repair with Flex Seal that it will last a lifetime. They also say that “it’s like a handyman in a can”. It’s easy to see that something as simple as liquid rubber should last a long time. It’s basically like a durable plastic, which seems like it would stand the test of time and wear and tear.

Most people will probably have a few things around the house in mind that they want to repair with Flex Seal, but to get your creative juices flowing, they say that you can use it to repair cracked planting pots, fountains, air conditioning drip pans, appliances, camping gear, PVC piping, and items in your motor home.

The Gimmicks
In the ad, he sprays some Flex Seal onto a metal colander and it makes it into a watertight bowl. That’s pretty impressive, and provides enough of a push for many people to go ahead and try it.

However, the gimmick that is supposed to push you over the edge is the one where they replaced the bottom of a rowboat with a screen door. They then spray the screen with Flex Seal to make it waterproof, and then put the boat back into the water. Not only that, but the announcer actually gets into the boat and starts rowing!

Check it out for yourself!

The Cost
Flex Seal originally sold for $20 plus shipping and handling if you ordered from their official sales channels. They’ve got the infamous buy one get one free just pay extra shipping “deal” so you end up with two cans of the stuff for $40. If you want a single can you can get one for just under $26 including shipping through Amazon.

The Commitment
Finding things around your home to use Flex Seal on is the only real commitment you have to get your money’s worth. If it works the way it shows on the ad you won’t have to worry about the problem any more, and you’ll have less things weighing on your mind, actually reducing your commitment level and providing more time, and cost savings than if you don’t have it handy.

Liquid sealants have been around for decades now, and the makers of Flex Seal in no way try to claim that they’ve invented the wheel here. They haven’t even re-invented the wheel, as there is nothing revolutionary about spray-able rubber. They’ve done a fine job showcasing and brainstorming the many uses that it can do, and introducing the benefits of liquid rubber to the masses.

The quality of the product itself is excellent, as long as you don’t expect it to be exactly like it’s shown on TV. It does provide a waterproof seal so you can fix things like a leaky gutter. Since it is an eye sore once you spray it onto any surface that isn’t black, it’s been made to be able to cover it up easily with paint, so you can match it to whatever you’ve sprayed it on.

However, there will be problems that can’t be fixed with Flex Seal, so it’s important to maintain reasonable expectations. Apparently, jobs that require a rounded surface or lots of bends with nooks and crannies are not very easily repaired. For example, if you have leaky pipes under your sink, it might not be able to repair them very well, especially if you can’t get the surface dry in order to apply it.

Final Flex Seal Review

They do a good job of pitching their product, and the fact that producing liquid rubber is not rocket science leads us to believe that this is a winner in most cases. It won’t work all the time, but if it only fixes a few big problems that would have cost a lot more to have a professional come out, then it’s worth it in the long run.

Also, once you have it, you’ll probably think of several other jobs that it can do around your home, or if something ever breaks, you’ll immediately think of Flex Seal as the fix.

Our Recommendation
If you have a job that requires a nice fine coat over a flat and even surface, you’ll most likely be well served by buying a can or two of Flex Spray. If you can only think of a few things to do with it, order just one from Amazon, but if you have a big job in mind, or you think you’d like to have a spare bottle in the home or workroom, get two from their main site to save a few bucks.

Official Website: Flex Seal

What do you think? Does Flex Seal work or not?

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{ 35 comments… read them below or add one }

Maison January 27, 2012 at 7:40 pm

Flex seal rocks!
I’ve used it a few times now, the ones that spring to mind are fixing a leaking roof in my shed and the most crazy one is i’ve used it on the underside of my car.
I needed some welding work done on the underside of the car and used flex seal to spray over to water proof it. has worked a treat so far!


Sandra Grove June 3, 2013 at 5:23 pm

We put a new porch roof on last summer. it comes up over the house roof. Put new shingles on it. Had a couple of rains and it leaked somewhere. We checked everything, even had a contractor check it. Can’t seem to find it. Now as of this spring, it has not leaked at all. we closed in the porch, and want to finish the inside. But I am afraid it might leak again. So my husband decided to buy some flex seal to run down the crease on both sides of the porch roof where it was molded into the house roof. Before we use it, I want to know if it really works, and is there a time to do it, or can you put it on when the roof is HOT! Will it break down over the years, can we trust it. Thanks for all your help


Rhonda July 9, 2013 at 2:31 am

I bought the Flex Seal on a desperate move. My husband was out of town and my washing machine sprung a leak underneath. I leaned the washer back, propped it up on bricks and headed off to purchase the Flex Seal. I let the drip dry, then I took a cloth and dried it again. I sprayed the Flex Seal over the hole and put a fan on it to dry. In two hours it was dry, so time to test it. I filled up the washer and no drip. It has been six months and it still hasn’t started leaking. The Flex Seal works. It really does!


Judy Wright January 13, 2016 at 8:50 pm

I am 66 years old and have no one to help with fixing up issues around the house. My washing machine, a 6 month old LG, just sprang a huge leak in the drain hose underneath the machine. I mopped up all the water that ran out from under the machine. Then I tilted the machine back at a 45* angle, found the split in the drain hose, which can NOT be removed from the bottom of the machine, and I have began to spray multiple layers of the Flex Seal all over the crack in this hose. I am PRAYING this stuff will work as advertised…..I just sprayed a third coat….am going to let this coat dry and will apply more…..My God, I hope this works…..your review has given me encouragement…..


Mike Doherty July 17, 2013 at 6:08 am

There are a whole bunch of uses for liquid rubber. But you probably should not cut out the bottom of a boat, replace it with a screen door, spray the whole thing with a ton of Flex Seal, and then try rowing it across a lake. That’s what happens in the commercial. Don’t be fooled. But if you want to fix a leak in a hose, or an issue on your roof, Flex Seal works really well. Something like this should be in every homeowner’s tool kit. And if you rent, this is probably already in your super’s tool kit.


David November 25, 2014 at 3:30 pm

This stuff does not work. I bought two cans to seal the holes in the plastic coated screen used as a skylight for my patio and it had 1.5 days to dry. It’s worthless. Today’s rain proved the leaking is now worse than prior to applying it. I wouldn’t waste my money. The screen door attached to a boat ploy on TV is false advertising.


Susan April 12, 2015 at 2:27 pm

Does not work as advertised, Tried it on the gutters and they still leak. It’s messy and even though it now comes in white and clear its an eye soar. Only use if its a flat, large surface that doesn’t need to be neatly applied. Also wear gloves. I had it all over my hands before I had had half coat on.


Steven Cyr November 15, 2015 at 10:02 am

Yes ! This works ! I have sealed the cracked bottom
of an ice bucket. Sealed !!!


T S Chiang February 6, 2016 at 5:37 am

Did anybody try to fix the leaks on a chest waiter with Flex Seal spray?


ahn otuh February 15, 2016 at 11:48 pm

any1 try a car’s leaking oil pan (rusty, bad)


JC February 22, 2016 at 1:20 am

Does this paint work for a porcelain TUB?? Pitted in bottom and flaking application of tub epoxy makes it scary looking. Can I put in two coats the spray enamel paint on tub and ealls


Adrienne March 28, 2016 at 6:49 pm

That’s what I want to know too. If you find out, pleas shoot me an email;


JC February 22, 2016 at 1:24 am

(Cont.) tub and tub walls?? Or will flex paint be good without painting enamel and St white through wear and use


Sharleen April 2, 2016 at 5:41 pm

I tried it on my drain pipe for the sink in my rv and it didn’t work. I couldn’t get it completely dry before appplying it and I think that’s why it didn’t work. I would like to know if it is safe for my rv rubber roof. I can’t use any products with petroleum in them.


G. Fast April 18, 2016 at 2:51 pm

I’m glad to hear that other people have had success with this product. Unfortunately, I have tried it in a number of different situations without success. For example,I tried to seal a leaky water pipe joint and a small hole in a pool solar panel but the seal would not hold under any water pressure. If you are contemplating using it for such applications, save your money. It’s also a very messy product to use. It seems to stick to everything other than where it should.


Haventeventriedityet May 4, 2016 at 12:55 am

Went to the website and got fooled by the offer. 2 cans of seal and 1 of shot for $19.99. plus s+h..
what they arent telling you “h” is $9.99 EACH can and then the “s” $9.95..and tax..for a total of $53.11!
Here begins the fun part..
After seeing the ridiculous total for the $19.99 offer..I had to enter my CC info to get the total..I decided not to order and exited the website. Amazon has an offer for 2 cans for $24.95..FREE shipping.
I placed my order and checking my bank I find that the $53.11 for the other offer has been processed.
WTF!! I call the wonderful folks at F**xseal and asked to please cancel the order which was too late as the order was being “filled at this moment” “All I can do is remove one of the handling charges.”
I agree to the term so I might get on with my wrong was I…
My phone rings a few days later…its some quick speaking youngster who tells me along with my order I will be receiving “$100 in gas coupons”..”along with some other offers for you to review for only one dollar”. Wait..what?? AND if I want the offer to continue it will automatically charge my CC $29.95 A MONTH!!
I adamantly refuse and get switched to another smooth talker and again I refuse over and over. Finally get off the phone..kinda po’d but life moves on…again WRONG..
The Amazon order arrives and there are 2- 14oz cans. That was 4 days ago. I tried to cancel the first order – paid crazy amounts of shipping for it – and placed the Amazon order on the SAME DAY. Today the F**xseal order was delivered..
2 cans..They are 10oz!! and what else?

They still charged me the shipping.
Havent even tried it yet…


Errol June 28, 2016 at 12:29 am

Contact your credit card company if you haven’t already and file a complaint. You might just get all your $ back. CC companies don’t like sham offers that screw their customers or companies that give you the run around.


Rocky May 24, 2016 at 4:34 am

This saved me $4,350 on emergency plumbing! After a plumber told me “these nothing invented to stop water leaks”…. hahaha no payday from me there! (For leaks use duck tape first then apply a coat of flex seal, it will drip so use gloves a towel, wait an hour for the seal to dry….then give it another coat) it works! I had several leaks from pipes under my house STOPPED! 🙂


Samantha June 6, 2016 at 7:38 pm

I tried this because we had a gutter that was gushing at a seam and could not afford to replace the gutter. I sprayed it once. Left it dry overnight and 24 hours sprayed it again. Just for safe measure I repeated a 3rd time. Next time it rained I checked the gutter and it was only leaking in one small spot. I large improvement. I was able to then wait until the next sunny day and was able to spray it a 4th and the next day a 5th time. During the next rain, there was no leak. I would not say that it worked like the commercials, but it did save me a few hundred dollars to not have to replace a gutter. It was also very messy and had some dip down the side of my house. However I would prefer the few white drips to the water damage that was likely to have occurred. While not a perfect solution, I think it would be beneficial to keep around the house and have added it to my tool bag.


Liz Macvenn June 10, 2016 at 10:56 pm

Does anyone have advice about me trying it on the bottom of of my above ground pool that has all of a sudden had tree roots starting to come up through at the end of last year, they are little pin prick sized holes please help, I really need advice on this, it sounds like a good idea to me, but, I don’t want to waste money if it doesn’t work


Renee June 22, 2016 at 9:55 am

Well I can’t wait to see if it works on a couple leaks on the fittings on my pool because its already filled so I am gonna buy it at Walmart and will let people know if it really does work on wet surfaces. If it does or doesn’t work the good thing is if it doesn’t work I can always take it back to Walmart and get my money back no loss. So keep an eye out for my comment on if it really does work.


Dee July 15, 2016 at 1:17 pm

Did it work for your pool?… I’m thinking about trying this out today.


Chris June 25, 2016 at 12:19 am

Had just a pin leak in the water hose, replaced with a hose repair kit (the one with a connector and clamps) Still had a small leak..used the flex seal on the whole thing (it was dry at that time because water was off) and did not stop the leak. (Flex Seal 15.00 at Walmart, new water hose 10.00 at Dollar store)


Greg McElroy July 13, 2016 at 3:40 pm

I tried it inside a bucket I use to hold wax. It had a few small cracks in one corner. After using flex seal about 3 or 4 times o the inside and outside guess what happened? It did not work. The bucket continued to leak so I through out the bucket and the flex seal. Go figure! Now how bout those Red Sox!!!


Charlieboy August 4, 2016 at 1:09 pm

Seems like the cost of the flex seal verses the cost of a new bucket wouldn’t have been a cost effective result even if it did work.


onecoollioness July 17, 2016 at 5:19 pm

I understand that water pressure affects the effectiveness of the product. Has anybody tried this with airbed leaks. I would think the air pressure without someone lying on the bed may prove it useless as well let alone with someone of some weight lying down on the airbed. I have an expensive queen airbed with built in air inflation system (run by electrical plug to socket) that has a leak I’ve yet to find but must now re-inflate every 40 minutes now. It’s all I have to sleep on while I save for a quality mattress on my fixed SSI as I have physical condition with my spine that makes sleeping a difficult proposition. The airbed actually has been the most comfortable sleep I’ve had in years. So buying another airbed or quality mattress is a costly event I am saving for but need to make what I’ve got last until then. Anybody tried FlexSeal on an airbed yet? Please advise results and thanks. in advance.


Kc August 26, 2016 at 3:40 am

To find the leak, mix up some soapy water in a spray bottle. Spray liberally until the leak(s) become evident from bubbles. Don’t forget that it could be an inlet or outlet valve as well. You can buy patch kits for it…they sell them for mattresses and rafts and such.


Kc August 26, 2016 at 3:45 am

Make sure to unplug it first!!!


john July 26, 2016 at 8:58 pm

shipped me wrong stuff called cc disputed charge give me refund les 7.95 for shipping told them I want the 7.95 because its your mistake u pay for your mistakes I don’t lets see what happens


Tom Zaffer August 15, 2016 at 3:01 pm

I have a garage that is over our living area that is 45 years old and the garage floor that is concrete has gotten pitted and when we drive our car into the garage in the winter and the snow melts off of our cars the water would seep thru the garage floor and come down into our living room ceiling. I tried flex shield gallon cans and spread it over our entire garage floor and it works great. We would empty a can on the garage floor and spread it around with a squeegie and then go over it with a roller to even it out. No more leaks.


Wally Stokes August 17, 2016 at 7:51 am

First of all CONTACT CREDIT CARD COMPANY anytime your unhappy. MOst cards double warranties, return dates, garuntee price match, and gauruntee that your not being ripped off.. Please don!t feel embarrassed we have all screwed the pooch per say. Credit cards are tools with resources we simply Don!t have as individuals. Let the Credit Card company do the work even if it is a little time down the road. Might be to late to stop payment but they have other tools and most of them under your benefits protect you for up to 180 days. Second every leak is different and there is usually a great sealant for your task. For plum binging , roofs, cutters, go to a professional store not big box. They actually usually have professionals working there. If you are a good diy!r big box and auto stores offer biggest selection. Remember different sealants will be general area of use roofing, plumbing etc. Go thru check list1) conditions ex. Use while wet cold/ hot etc. 2) prep. 3) Pottable(working time) if two pt time you have to use material. 4) set time(time where products stay together without force). 5) Working time (time it takes for sealant to start securing usually chemically) usually 4th of cure time. 6) cure time( time it takes for product to be completely usable. Feel free to ask for advice. NOT RESPOSIBLE for any type of Injury, equipment, product damage, not liable for pets , children, people who should pay to have work done. This is only advice please consult Proffessional Please use your CREDIT CARD as the anti slam TOOL that it is. Not liable but will try to help. Wally Da Honey list doer


Sal September 13, 2016 at 1:18 am

Really wanted to buy Flex Seal for my modular’s roof but now after reading what a pain in the butt it is to deal with the company I think I’ll pass.


Joe September 15, 2016 at 7:45 pm

Would it work on bladder bags ?


Victor October 14, 2016 at 3:01 pm

Does not work. Had a metal feeder that leaked through small holes in the lid. Tried flex seal on both sides of the lid. A year later, i had a mess to clean up. The flex seal on the top side had cracked/broken into many pieces, letting water get in.


Rebekah October 22, 2016 at 11:12 pm

Bought a can at Walgreens to try and repair a crack in the bath tub which is leaking water out down on the floor after baths and showers etc. I sprayed it last night and sprayed another coat this morning. Sure hope it works. Otherwise it’s buy another bath tub. 🙁


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