Leaky Aluminum Boat - Flex Seal VS JB Weld FIX 

I had a seam like that leaking. I took the time to pry open the seam a bit, and cleaned it thoroughly with alcohol. Then took a Marine Adhesive and Sealant and I mushed it into the open seam as thoroughly as possible, then I hammered the seam back closed, and wiped everything clean. It's been 11 years now, still dry as a bone!

JB water weld is awesome stuff! Someone replaced most all of the factory rivets that penetrated the hull for the floor stiffeners with SST nuts and bolts using bathroom caulk for sealant. Well, it leaked badly! I took off the hardware, cleaned everything, hit the hull penetration with some light heat then, reassembled it all with a 1/16 think slice of water weld mixed up and placed under the washer. Also added some more on the top of the washer. Then used Rustoleum Gloss Black oil paint on the water side of the hull. That was 10 years ago. Watertight baby! Let the fishing commence! 😃

Good job ! Flex Seal is amazing stuff, I have used it on a leaky boat myself. Easy to apply and it works !

Right on, man. Thank you!

Great job! I have used Flex Seal on a few different aluminum boats with excellent results. I used one of those cheap "chip" paint brushes to "paint it on" over all the seams and rivets. I do all the rivets on outside of boat and inside. Take your time on the inside especially if you plan on putting a floor in. Always great results. Enjoy the outdoors young man!

Best stuff on the market I used it on my aluminum boat and it works💪🏽💪🏽👍🏾

Heck yeah, Flex it!!!

I will try it on a plastic gas tank & see what happens in 3 days. Great video 👍

Also 3m 5200 marine sealant works good

If it's simple and works, it ain't stupid. I did something similar with my 63 HaberCraft 9 ft, I used a can of TremClad paint. Sealed the leakes and showed my where they used to be.

I just bought 2 cans of clear spray on flex seal!!! Hope it will work on my aluminum boat that leaks.. I'm going to seal the whole bottom of the boat, I think its leaking throw a few Rivets.. thank you for your time, and testing.👍

You need to use JB Weld Marine two part adhesive. Clean the area good and apply the JB Weld, it will set up and you can drill and tap it...very strong and waterproof

Distribuidor en MEXICO? Gracias

I have used flex seal spray on a couple of aluminum boats. It works great. I just paint the inside of the boat below the waterline. It looks great too.

Thanks for the information. Got a leaky 10 ft jon boat myself that my uncle gave me. Is it still holding up well today?

The front with JB is sealed? You only talked about the stern. And it seems as though it was in an area of the stern you didn’t seal

Glad the flexseal worked for your application. As some other people pointed out, you used the wrong jb weld. Go with the marine weld for your application, it’s rated to be submerged under water and for water applications. Hell, even the jb waterweld would have worked. But the marine weld is spreadable and more like a glue or paste, similar to the flexseal consistency

Did you measure the crack gap size? One just looks way bigger than 15 mil: that's the max that the specific JB weld product you're using is rated for ... Seeing as how you have the boat out of the water and under cover, why no prep of the cracks? SOP is to DP, then drill a crack-termination at each end, prep for selected repair treatment. I've used Flex-Seal and it is reliable if the prep instructions are followed ...

Ngl I was thinking about just coating an aluminum boat with flex a seal inside and out, call it done 😆

Why was the surface not cleaned first, say with a rotary wire brush put into a electric drill or so?

Hey I know this was posted awhile back but I’m desperate, I bought a very similar aluminum boat and I can’t find a drain plug that fits. Looks like what you have there is exactly what I’m looking for, where did you get it??

You used the wrong jbweld. Should used jbwaterweld. You could have used it to seal the leak while you where in the boat and it was leaking.

Try using a cheap 1 inch paint brush next time worked for me😊

I’m curious how long flexseal will last. Can you comment or some thing how long in years the boat didn’t leak?😅

i leave my jon boat in the water about 8 months a year. has anybody tried flex seal under similer conditions?

Is it paintable??

Using Flex Seal to totally coat the underside of my 14 ft. old, leaky Jon boat. Using a paint brush to apply it, I’m expecting it will seal it all up nicely. Thanks for the video!

Bro got a leak in his smile too 😂

For about a week

THATS ALOTTA DAMAGE!

If you used the right kind, and actually used a reasonable amount, that boat would have outlived you.

i would have used 3M 5200 you put that on and nothing is getting into the boat...and you'll never be able to take it off lol

Whatever floats your boat pal

Wtf. Try cleaning the area where jb weld goes. Get marine jb weld or jb kwik weld. The split at the front was filled with jb then gone over with flex seal. Flex seal would not fix a split that wide.

It's the worse crap I've ever used. It peeled right off and will no hold submerged in water.

Horrible comparison

You will have more invested in jenky repairs than the boat is worth to begin with