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-   -   What do you all think of "Flex Seal" (https://www.cruisersforum.com/forums/f124/what-do-you-all-think-of-flex-seal-237592.html)

Rohan 27-07-2020 08:36

What do you all think of "Flex Seal"
 
If you haven't seen the ads, Flex seal is basically a group of products that claim to provide a flexible, water tight seal, applicable with a spray can, tape, or caulk type gun. https://www.flexsealproducts.com/

I have seen a lot of these commercials, including where this guy makes a functioning boat out of the product, but normally I don't pay that much attention to TV.

There are many other sealants on the market. But the commercial claims it even hardens UNDER WATER, and that got my attention. That is a big deal, and something that I could have really used in the past. (previously, the only product I knew of that would fix a leak underwater was this stuff for swimming pools and it was actually two different types of paste that you had to mix together just prior to applying). So using Flex Tape, for example, you could theoretically patch a small leak on your boat, or use the Flex glue or Flex Shot to repair through hull seals, even if they are underwater.

So I bought some flex glue. At the moment, I don't really have anything critical to use it on so I made a small test, deliberately as difficult as possible. I filled a bucket with cold water. Then put two pieces of very smooth plastic under the water and glued them together. I really didn't think this would work, but I felt a grip on it right away. The product says it takes 24-48 hours to fully cure (underwater might be different, I don't know). But about 12 hours later I checked it, and they were holding together pretty strongly. That's amazing!! I have never seen anything do that before.

On the other hand, not all reviews are positive. The most common complaint on web sites seem to be that the stuff requires a special type of caulk gun and is sometimes too difficult to push out of the tube (apparently it has a shelf life of 24 months and older product apparently is very thick and more difficult to apply than when it is fresh)

Have any of you tried this? What do you all think of its potential?

tkeithlu 27-07-2020 08:44

Re: What do you all think of "Flex Seal"
 
I have not tried it, but I will note in the general case,

1. There have been a lot of improvements in adhesives in the last ten years or so, and we are benefiting, particularly (to me) in the realm of tapes that will stick where no tape used to.

2. Commercial claims run well beyond reality, and there is mouse milk out there. Remember that bee's wax-like paste that was supposed to seal big gaps in your boat a few years ago? Even West Marine marketed it for awhile.

CaptTom 27-07-2020 14:03

Re: What do you all think of "Flex Seal"
 
I was talking to someone the other day about this. We've both used Flex products and found that they lose their flexibility and adhesion after some time, maybe one to five years. My experience was one year on gutters, his was 3-5 years sealing around a skylight. Both eventually leaked. Obviously both are exposed to sun, rain, hot and cold. Maybe out of the elements that wouldn't happen.

Ndavies 27-07-2020 14:16

Re: What do you all think of "Flex Seal"
 
My friend had some damage the other day while we were at sea due to an overtopping wave damaging his da it supports. He tried to seal a small hole with flex seal tape....but found it wonít stick to fiberglass when wet. So much for the ads!

Minggat 28-07-2020 09:11

Re: What do you all think of "Flex Seal"
 
I bought a roll of the tape. Last week I tried to get some off the roll. Good thing I didn’t NEED it

I gave up. More important things to do. But now I know that I should expect a problem.

astokel 28-07-2020 09:52

Re: What do you all think of "Flex Seal"
 
I've never seen the tape but I've used the transparent spray and it works well with multiple coats following instructions. The transparent goes on 'almost' invisibly on an older boat. I've only been using it for a year so maybe it will require refreshing.

JON REISWIG 28-07-2020 09:56

Re: What do you all think of "Flex Seal"
 
I used some of the flex seal glue on a dolly that had broken that I use to haul large sections of wood I split for fire wood I was surprised that it worked well. Problem I ran into was getting the glue out of the tube. I had to use a pliers to force it out and basically ruined one of the tubes but did get enough out to fix the dolly

Monte Cresto 28-07-2020 10:10

Re: What do you all think of "Flex Seal"
 
I don't know about using it on our boat, however, I've used it to seal a
wood stove leak on our roof about 3 years ago and still doing it's job.
It tends to get much harder with time but still keeps it's adhesive properties.

bailsout 28-07-2020 10:12

Re: What do you all think of "Flex Seal"
 
I posted a while back that a dock buddy had brushed it on at home below the waterline and now claims that his bottom paint is collecting sea growth, but not the Flex Seal.

scubadad 28-07-2020 10:39

Re: What do you all think of "Flex Seal"
 
I have used the liquid poured from a gallon can into a roller pan and applied with a regular paint roller. This was to seal the roof of a few metal containers used for storage. The stuff went on without much surface prep and sealed very well, dried overnight so that a couple of coats were possible.
I just bought a gallon of white to be used to paint the inside walls and floor of two lazarets and while a gallon is likely too much, it was as cheap as 2 1/2 quarts ($90 at Lowes). I'm sure it will work well enough to seal out water intrusion.

Cheechako 28-07-2020 11:03

Re: What do you all think of "Flex Seal"
 
All the particular group of adhesives and glues like Gorilla Glue are aided by water/moisture in curing.
I have yet to find one of these mass marketing miracles that are really much good. But welcome being surprised....

jmschmidt 28-07-2020 11:35

Re: What do you all think of "Flex Seal"
 
One product which features a large animal in it commercials is junk. The glue, once open, turns hard within a couple of weeks or so and the tape fails as soon as any appreciable amount of water comes in contact with it.

dlane1181 28-07-2020 12:29

Re: What do you all think of "Flex Seal"
 
We had a flange come partly loose from the intake side of a 30-gallon sump tank. It was too difficult to reach without taking down numerous components that prevented access. I cleaned the area as best I could with rags tied on various extenders, and then liberally applied liquid Flex Seal all around the flange.
It sealed the leak 100% for about a year, and probably would have kept it sealed, but I was torquing on the sump hoses a couple of feet away and it torqued the flange completely off the top of the tank.
There was no way around dismounting everything and doing a proper repair job. But the Flex Seal was a perfect stopgap repair.
We also had a leaky plexiglass hatch cover for a large hatch on the foredeck. Thickly gooped the liquid Flex Seal between the plexiglass and the teak frame for the hatch, and again, it worked great for about a year, which included a transatlantic crossing with plenty of water over the bow. And it came off quite easily when we bought a nice piece of teak timber to reenforce the seam properly and seal with Sikaflex.
So, Flex Seal was 2 for 2 for us. Not an adhesive cure all by any means, but terrific for quickly plugging ~1/4” gaps and seams.

a64pilot 28-07-2020 12:34

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by Cheechako (Post 3196224)
All the particular group of adhesives and glues like Gorilla Glue are aided by water/moisture in curing.
I have yet to find one of these mass marketing miracles that are really much good. But welcome being surprised....


Often itís just repackaged existing products with a catchy name and heavily marketed at a jacked up price.

billdre 28-07-2020 12:35

Re: What do you all think of "Flex Seal"
 
So I have one specific use for the Flex Seal spray that has worked well.
At the aft end of my encapsulated keel where it curves into the hull there was a small crack which dripped water after the boat was hauled in the fall. I had it examined and the fiberglass guy says it was an easy fix. He grinds it back to solid underlay and rebuilds the curve. Next fall it's cracked again and dripping until Spring.
This crack doesn't reach the interior of the hull. No leaks inside at all. So I conclude that the issue is the boat gets fixed when it resting on the keel then when they lift it to launch me it opens up again. So the part that attacked me to "Flex Seal" is the flex part. Five years ago I removed all the bottom paint from the area, sanded it and followed the instructions on the can. Several layers over time. Next Spring no leak. It lasted two years then I did it again. Worked again. Next summer it will probably be due.
It's obviously a very specific minor problem. But it keeps the sea water from getting up into the underlying fiberglass or whatever else might be affected. So I like it.

tjandoverguy 28-07-2020 14:35

Re: What do you all think of "Flex Seal"
 
ihave a 98 hunter it leaked around almost flat window cleaned and used silicone one coat stopped leak i have coated all intrusions

atlroofman 28-07-2020 15:06

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by Rohan (Post 3195305)
If you haven't seen the ads, Flex seal is basically a group of products that claim to provide a flexible, water tight seal, applicable with a spray can, tape, or caulk type gun. https://www.flexsealproducts.com/

I have seen a lot of these commercials, including where this guy makes a functioning boat out of the product, but normally I don't pay that much attention to TV.

There are many other sealants on the market. But the commercial claims it even hardens UNDER WATER, and that got my attention. That is a big deal, and something that I could have really used in the past. (previously, the only product I knew of that would fix a leak underwater was this stuff for swimming pools and it was actually two different types of paste that you had to mix together just prior to applying). So using Flex Tape, for example, you could theoretically patch a small leak on your boat, or use the Flex glue or Flex Shot to repair through hull seals, even if they are underwater.

So I bought some flex glue. At the moment, I don't really have anything critical to use it on so I made a small test, deliberately as difficult as possible. I filled a bucket with cold water. Then put two pieces of very smooth plastic under the water and glued them together. I really didn't think this would work, but I felt a grip on it right away. The product says it takes 24-48 hours to fully cure (underwater might be different, I don't know). But about 12 hours later I checked it, and they were holding together pretty strongly. That's amazing!! I have never seen anything do that before.

On the other hand, not all reviews are positive. The most common complaint on web sites seem to be that the stuff requires a special type of caulk gun and is sometimes too difficult to push out of the tube (apparently it has a shelf life of 24 months and older product apparently is very thick and more difficult to apply than when it is fresh)

Have any of you tried this? What do you all think of its potential?

Opened my commercial roofing co in 1987, I have used litterly everything that stops water. The family of products they are reffuring to are elastomerics.
Only use solvent base elastomerics ! never any water based.
Things we use that stick and hold through water are Geocell in a tube or can (thick liquid) , Eternal Bond reinforced tape, And for out of the water uses always use the Eternal Bond primer. You can use closed cell fabric with the Geocell liquid to give it tinseil strength enough to bridge voids. They are all available at your local commercial roofing supply wherehouse and can be sold to the public.

dduresky 28-07-2020 17:55

Re: What do you all think of "Flex Seal"
 
My hypalon dinghy had a 2 inch tear. after 3 unsuccessful repair attempts costing about$150 i was about to give up. Tried Flex Seal. Two years later... no leaks. YMMV but I love the stuff

sanibel sailor 28-07-2020 18:26

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by billdre (Post 3196288)
So I have one specific use for the Flex Seal spray that has worked well.
At the aft end of my encapsulated keel where it curves into the hull there was a small crack which dripped water after the boat was hauled in the fall. I had it examined and the fiberglass guy says it was an easy fix. He grinds it back to solid underlay and rebuilds the curve. Next fall it's cracked again and dripping until Spring.
This crack doesn't reach the interior of the hull. No leaks inside at all. So I conclude that the issue is the boat gets fixed when it resting on the keel then when they lift it to launch me it opens up again. So the part that attacked me to "Flex Seal" is the flex part. Five years ago I removed all the bottom paint from the area, sanded it and followed the instructions on the can. Several layers over time. Next Spring no leak. It lasted two years then I did it again. Worked again. Next summer it will probably be due.
It's obviously a very specific minor problem. But it keeps the sea water from getting up into the underlying fiberglass or whatever else might be affected. So I like it.

does it keep water out or keep it in?

I used a quart of the white liquid stuff to paint some black foam rubber mats used as cockpit cushions so they will be cool enough to sit on. Seems OK with very limited use so far.

Clamdigger 28-07-2020 18:30

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by Minggat (Post 3196141)
I bought a roll of the tape. Last week I tried to get some off the roll. Good thing I didnít NEED it

I gave up. More important things to do. But now I know that I should expect a problem.

Yeah, the tape rolls have a clear 'liner' that pulls away from the adhesive side as one tries to 'unroll it' :nonono: Which means the companies that sell it figure anyone using their product will have 3 hands:nonono:

Clamdigger 28-07-2020 18:32

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by jmschmidt (Post 3196250)
One product which features a large animal in it commercials is junk. The glue, once open, turns hard within a couple of weeks or so and the tape fails as soon as any appreciable amount of water comes in contact with it.

Don't be shy here, if it's a 'Gorilla Glue' product, then mention the name! You are giving your opinion as a paying customer. Nothing wrong with pointing out a products defects, some companies actually respond to consumer comments.

CaptTom 29-07-2020 04:41

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by dduresky (Post 3196466)
My hypalon dinghy had a 2 inch tear. after 3 unsuccessful repair attempts costing about$150 i was about to give up. Tried Flex Seal. Two years later... no leaks. YMMV but I love the stuff

Very interesting! Did you apply a patch using Flex Seal as the adhesive, instead of the expensive 2-part stuff? Seems like a good option for emergency repairs when the "correct" adhesive isn't available. Especially if it works better than that stuff and costs less.

I'm wondering if a light coating along the seams might finally kill that very slow leak I have from my dinghy's starboard tube. Mine is PVC, so not sure if it'll work the same though.

MV Wanderlust 29-07-2020 05:36

Re: What do you all think of "Flex Seal"
 
My aluminum wet/dry vacuum canister developed a small leak. It gets repeated exposure to fresh and salt water. I used a can of the spray Flex Seal to coat the inside of the canister and have had no leaks in a year and a half. A buddy here in the marina insists he used some of the 4" tape to seal a small leak in a coolant hose while underway on a trip. It sealed it so well that he has yet to get around to replacing the hose and that was almost four years ago. I've seen the hose and the tape wrap but I can't attest to the length of time it has been there.

billdre 29-07-2020 07:49

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by sanibel sailor (Post 3196484)
does it keep water out or keep it in?

I used a quart of the white liquid stuff to paint some black foam rubber mats used as cockpit cushions so they will be cool enough to sit on. Seems OK with very limited use so far.

No water to keep in. It's dry by the time I apply the Flex Seal in the Spring before launch.

dduresky 29-07-2020 17:35

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by CaptTom (Post 3196660)
Very interesting! Did you apply a patch using Flex Seal as the adhesive, instead of the expensive 2-part stuff? Seems like a good option for emergency repairs when the "correct" adhesive isn't available. Especially if it works better than that stuff and costs less.

I'm wondering if a light coating along the seams might finally kill that very slow leak I have from my dinghy's starboard tube. Mine is PVC, so not sure if it'll work the same though.

I brushed it on over one of the 2 part patches. It was a last ditch effort and not very pretty but hell... 2 years old and holding

BVLew 29-07-2020 18:09

Re: What do you all think of "Flex Seal"
 
I used the tape to fix a tear in a Porta-bote. Worked fine for the few months while I still had the dinghy. Haven't heard back from the guy I sold it to (was switching to a hard dinghy anyway).

Chotu 29-07-2020 18:22

Re: What do you all think of "Flex Seal"
 
I have tried it in part of my construction of windows on my bridge deck. As an extra barrier to leakage.

It’s been baking in Florida sun and getting rained on almost daily.

Looking forward to seeing how it held up in a few months when I return

witzgall 03-08-2020 06:43

Re: What do you all think of "Flex Seal"
 
For underwater repairs, West System Six10 cures under water.

Chris

taxwizz 03-08-2020 06:47

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by Minggat (Post 3196141)
I bought a roll of the tape. Last week I tried to get some off the roll. Good thing I didnít NEED it

I gave up. More important things to do. But now I know that I should expect a problem.

But...You have proved that it sticks to itself pretty well.
:thumb:

raclapp 03-08-2020 06:58

Re: What do you all think of "Flex Seal"
 
Used it repeatedly as tape and as spray paint. Works great on kids old canoe. Fiberglass + gelcoat weren't issues. Kids beat the heck out of that canoe. Used tape on floor, worked great for sealing some cracks and for a light anti skid over bottom of ribs.

taxwizz 03-08-2020 06:59

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by dduresky (Post 3196466)
Tried Flex Seal. Two years later... no leaks. YMMV but I love the stuff

YMMV ??
What is YMMV ??
Sorry...I am an old guy.
:confused:

Wheels53 03-08-2020 07:05

Re: What do you all think of "Flex Seal"
 
I used the flex seal tape to repair a small hole in my Avon Inflatable Dinghy (Hypalon fabric). It seems to have worked very well. Did the repair 3 weeks ago and have not had to pump up the dinghy since.

taxwizz 03-08-2020 07:14

Re: What do you all think of "Flex Seal"
 
What I take away from this discussion is that Flex Seal works pretty well....for a while.
But the leak will require a more permanent solution within a year or two.
But it is still good for emergencies.

LifePart2 03-08-2020 07:21

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by taxwizz (Post 3200502)
YMMV ??
What is YMMV ??
Sorry...I am an old guy.
:confused:

YMMV = Your Mileage May Vary -i.e. that was my experience, but you might get different results

JBsurfin 03-08-2020 08:03

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by Rohan (Post 3195305)
If you haven't seen the ads, Flex seal is basically a group of products that claim to provide a flexible, water tight seal, applicable with a spray can, tape, or caulk type gun. https://www.flexsealproducts.com/

I have seen a lot of these commercials, including where this guy makes a functioning boat out of the product, but normally I don't pay that much attention to TV.

There are many other sealants on the market. But the commercial claims it even hardens UNDER WATER, and that got my attention. That is a big deal, and something that I could have really used in the past. (previously, the only product I knew of that would fix a leak underwater was this stuff for swimming pools and it was actually two different types of paste that you had to mix together just prior to applying). So using Flex Tape, for example, you could theoretically patch a small leak on your boat, or use the Flex glue or Flex Shot to repair through hull seals, even if they are underwater.

So I bought some flex glue. At the moment, I don't really have anything critical to use it on so I made a small test, deliberately as difficult as possible. I filled a bucket with cold water. Then put two pieces of very smooth plastic under the water and glued them together. I really didn't think this would work, but I felt a grip on it right away. The product says it takes 24-48 hours to fully cure (underwater might be different, I don't know). But about 12 hours later I checked it, and they were holding together pretty strongly. That's amazing!! I have never seen anything do that before.

On the other hand, not all reviews are positive. The most common complaint on web sites seem to be that the stuff requires a special type of caulk gun and is sometimes too difficult to push out of the tube (apparently it has a shelf life of 24 months and older product apparently is very thick and more difficult to apply than when it is fresh)

Have any of you tried this? What do you all think of its potential?

I bought the parches for my boating buddies as a xmass gift a couple yrs back. One guy had a 1" hole punched into his hull. He threw one on the inside and one on the outside and its stopped the leak. Was able to get back to his marina for a hail out. UL did a verification on this product and verified it does what it says. It will adhere underwater.. My buddy was proof enough for me.

JBsurfin 03-08-2020 08:07

Re: What do you all think of "Flex Seal"
 
Quote:

Originally Posted by Ndavies (Post 3195629)
My friend had some damage the other day while we were at sea due to an overtopping wave damaging his da it supports. He tried to seal a small hole with flex seal tape....but found it wonít stick to fiberglass when wet. So much for the ads!

I gave patches to boating friends, one guy had a 1" hole punched in.. His stuck solid to fiberglass. placed on inside, another on the outside. made it back to port.

kvstein 03-08-2020 09:17

Re: What do you all think of "Flex Seal"
 
Flex Seal was of no help when I tried to reseal the windows on my C&C 41. But then again nothing worked. I had to fiberglass the whole area and cut out hatches for windows from New Found Metals.

zboss 03-08-2020 09:26

Re: What do you all think of "Flex Seal"
 
Flex Seal Tape was recommended by my rigger for the mast partner on our keel stepped mast and it works really well. Cheap and if it fails I can pick up a new roll cheaply at Home Depot.

rwaldrop13 03-08-2020 10:08

Re: What do you all think of "Flex Seal"
 
While I haven't used it on a boat yet, I had to purchase the dinosaur tape for an emergency repair on my wife's Saturn Ion. The top of the windshield has a gasket that almost looks cosmetic, but actually keeps rain and dirt out of the windshield mounting trough. While in transit between NC and FL, the gasket came out - age of the car I guess. I went to the nearest auto parts store and purchased a roll of the tape, and laid it across the windshield and gasket. It holds beautifully and is showing no signs of letting go. The tape actually blends well with the gasket and the only reason for actually removing it would be to replace the original gasket.

tomtriad 03-08-2020 12:13

Re: What do you all think of "Flex Seal"
 
I used some Gorilla flex tape (1/2 price of Flex) to patch a 2' long crack along the keel of my Sunfish as a temporary fix. Worked great, stayed put for 2 months. Keel split open about 1/4 to 1/2" wide. Had to be careful launching from dock to not peel the end off. Had good results with Locktite marine adhesive, good down to 32 degrees F provided surface was dry - careful to examine/squeeze tube to make sure it hadnt kicked on the shelf at HD.


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