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Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray

4.3 4.3 out of 5 stars 3,279 ratings
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Amazon's Choice in Fuel Leak Detectors by Bar's Leaks

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Purchase options and add-ons

  • Repairs gasket leaks
  • Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks; Seals freeze plug leaks; Repairs gasket leaks and heater core leaks; Lowers water temperature
  • Seals freeze plug leaks
  • Seals radiator leaks
See more product details

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Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray
Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray
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Price-13% $7.41
Typical:$8.48
$11.50$17.94-30% $13.95
List:$19.99
$14.99$7.99
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Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Customer Ratings
Easy to use
4.6
4.6
4.2
4.7
4.2
Value for money
4.2
4.6
4.4
4.5
4.4
Mileage
4.1
4.5
4.1
4.6
4.1
Sold By
Amazon.com
Nichols warehouse
B and S Supply
The GENERAL Store
Amazon.com
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From the manufacturer

LEGENDARY PERFORMANCE FORMULAS Since 1921
Heater core stop leak

Frequently Asked Questions

Can Bar’s Leaks Liquid Aluminum be installed in existing antifreeze coolant?

Yes, Liquid Aluminum is specifically designed to be directly added to the cooling system without having to flush out the antifreeze. It also can be used in water alone. But if using in water, it is recommended that another bottle of Liquid Aluminum be added to the system once antifreeze is installed.

Will it work in the new extended life antifreeze?

Yes, Liquid Aluminum works with all types of coolant including yellow, orange, pink, red, blue and green silicate based and non-silicate based OAT/HOAT antifreeze and/or water.

How long does it take to see results?

We recommend you drive/idle the vehicle for 10 to 20 minutes. In most cases the leak will be sealed instantly, but others will require up to 20 minutes. If the leak is not sealed in 20 minutes, a second application may be required or mechanical repair may be needed.

What's in it?

  • The two key ingredients in this product are Liquid Aluminum and Xtreme Cool.
  • Next-generation stop leak line that not only seals leaks, but also conditions the system.
Oil Leak Problem? Low Oil Levels? Hearing Loud Sounds from the Engine? Temperature Warning Light? Smoke from the engine?
Customer Reviews
4.0 out of 5 stars
301
4.2 out of 5 stars
2,429
4.3 out of 5 stars
2,169
4.3 out of 5 stars
282
4.3 out of 5 stars
3,279
Identify the Symptoms Black or dark golden brown spots or puddles beneath my car. My engine is reading low oil levels, but not sure it is leaking. I'm hearing a ticking or knocking sound coming from the top of my engine. I have a temperature warning light or temperature gauge is at high end. I'm seeing white smoke or steam coming from engine/hood
Best Solution An oil leak may start out small, but can lead to a unplanned costly repair down the road. Use Bar's Leaks Main Seal Motor Oil Leak Repair to stop leaks and continue on down the road. Bar's Leaks Rear Main Seal Repair Concentrate. Bar's Leaks Engine Repair. Bar's Leaks Cooling System Repair. Bar's Leaks Liquid Aluminum Stop Leak
Alternative Solutions Bar's Leaks Rear Main Seal Repair Concentrate Bar's Leaks Main Seal Motor Oil Leak Repair Bar's Leaks Main Seal Motor Oil Leak Repair Bar's Leaks Liquid Aluminum Stop Leak Bar's Leaks Cooling System Repair.
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Made in the United States

Each individual Bar’s Leaks product is formulated and manufactured right here in the U.S.A. We’re committed to creating fast and affordable products that fit perfectly into your lifestyle and budget. Choose Bar’s Leaks, so you can discover just how simple automotive maintenance can be when you have the right tools.

Bar's Leaks: Stop Leaks. Not Life.

Bar’s Leaks is more than just a stop-leak company

We are a team of enthusiasts and experts who create memorable experiences with each and every one of our customers. Wither 75 years of experience in helping everyday automobile owners repair leaks, we have the track record of success and long history that demonstrates our commitment and passion to helping drivers of all experience levels. You’ll see that our passion shines through in everything we do.

Product Description

Bar’s Leaks Liquid Aluminum Cooling System Stop Leak is the best radiator stop leak money can buy. Scientifically formulated to permanently seal coolant leaks that are the cause of most overheating problems. Contains Xtreme Cool which stops overheating and reduces water temperature. Liquid Aluminum is part of the next generation stop leak line. It is to safely and easily seal leaks in plastic, aluminum and metal radiators, heater cores, gaskets and freeze plugs. Works in cars, trucks, vans, SUV’s and RV’s. Use with all types of antifreeze including conventional green or blue (silicate-based) and extended life red/orange or yellow (OAT/ HOAT) antifreeze. For most vehicles leaks stop in only a few minutes. FUNCTION - Stop Radiator & Coolant Leaks DOSAGE -Use – 1/2 (half) bottle in a small cooling systems, such as 4 cylinders with no A/C. Use 1 (one) bottle for regular size systems, most 4, 6, 8 and 10 cylinder engines. Seals Radiator Leaks Seals Freeze Plug Leaks Repairs Gasket Leaks Repairs Heater Core Leaks Lowers Water Temperature

Product information

Technical Details

Additional Information

Warranty & Support

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Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray


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What's in the box

  • 1 Bottle Rislone 4405 Engine Oil Supplement, 11oz
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    Customer reviews

    4.3 out of 5 stars
    4.3 out of 5
    3,279 global ratings

    Customers say

    Customers like the ease of use and performance of the bonding adhesives. For example, they mention it works fast and easy, and it stops leaks. That said, some complain it clogs up their engine and heater core. Opinions are mixed on value and leakage.

    AI-generated from the text of customer reviews

    158 customers mention121 positive37 negative

    Customers like the performance of the bonding adhesives. They say it works amazing, the heater core is still working best, and it works in short time. Some customers also mention that the product is good and legit.

    "Good product, would recommend" Read more

    "...this stuff in just to see if it would work and to my surprise it works great and it started working about 12 minutes into idling" Read more

    "Bars is a great product, it was proved to me once by a friend of mine took a ice pic and punched holes in a aluminum can then poured this stuff in..." Read more

    "...this product is a clever solution to mitigate leaks but unlikely to solve problems - which is the expectation I had when I bought it...." Read more

    21 customers mention21 positive0 negative

    Customers find the bonding adhesives super easy to use and fast acting. They also say it saves them hundreds.

    "Easy to use... I didnt need to use the whole bottle.." Read more

    "...Very happy with this product. Worked as described, easy, inexpensive, and fast results. Would recommend for sure." Read more

    "Simple to use and it worked" Read more

    "Bar's Stop leak worked great and fast acting. Would purchase again." Read more

    179 customers mention97 positive82 negative

    Customers have mixed opinions about the leakage of the bonding adhesive. Some mention that it stopped their leak, while others say that it increased in speed.

    "Seem to work for minor leakage. Follow directions." Read more

    "After use the leak increased in speed. I can not be sure this was related to that but it did happen at the same time. I drove 2 hours after use...." Read more

    "Stopped my radiator leak quickly. Just be sure to read the instructions and follow them to a T. There are no shortcuts with these types of products." Read more

    "The heater core in my 1995 Grand Cherokee has been seeping since 2000. I used this product in 2000 and it fixed the problem...." Read more

    23 customers mention15 positive8 negative

    Customers are mixed about the value of the bonding adhesive. Some mention it's a great product for the price, while others say it was a waste of hard earned money.

    "...Very happy with this product. Worked as described, easy, inexpensive, and fast results. Would recommend for sure." Read more

    "Perhaps I did something wrong but this was a waste of money...." Read more

    "Didn't stop the leak but slowed it down considerably. Worth the money." Read more

    "...Great product and saves on repairs." Read more

    39 customers mention8 positive31 negative

    Customers are dissatisfied with the temperature of the bonding adhesive. They mention that their car started overheating, the oil cooler started pouring out coolant, and the heat stopped working within 20 minutes of operation. The radiator started steaming and sputtering, and liquid has blocked the coolant flow. Customers also say that it's scary to put strange stuff in their cooling system and that it ends up messing up their heater core.

    "...After refilling with new antifreeze, the heater core started seeping and fogging up the windshield again...." Read more

    "...My heat stopped working within 20 minutes of operation. Maybe some people have decent luck with this stuff...." Read more

    "...overflow on the radiator cap, it will plug that area, and could damage a plastic radiator. Speaking from experience...." Read more

    "...I'm very satisfied, warm, and I can breathe again." Read more

    10 customers mention0 positive10 negative

    Customers are dissatisfied with the clogging of the bonding adhesive. They mention that it clogs their heater core, engine, thermostat, and heater line filter. Some say that the thick liquid clogged in the inlet of the radiator.

    "...Stopped it for 8 months. Did clog a screen on my heater core. That stopped cabin heat. Was hard to get to, but I was able to clean it...." Read more

    "...This product disabled my heating system. It clogged it up. No heat. Wife unhappy...." Read more

    "...it seems unable to get into the deeper of car radiator tank but clog in the inlet of the radiator...." Read more

    "...2 days then car started leaking again and on top of that my heater core is now clogged. Waste of money." Read more

    It clogged my thermostat & heater core
    1 Star
    It clogged my thermostat & heater core
    2013 Chevy Volt. I had a leaking engine radiator due 2 road debris and heard good things about this product. Don't make the mistake of adding additional death-glitter if the leak starts to accelerate again, it may clog up your thermostat and heater core.Do not buy into their claims of "Manufacturers recommend any insoluble particles in the cooling system be no larger than 700 microns. Bar's Leaks Radiator Stop Leak exceed manufacturer's recommendations at 420 microns."-- does not mean it won't clog things up! Be careful.
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    Top reviews from the United States

    Reviewed in the United States on March 13, 2024
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    Reviewed in the United States on October 2, 2015
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    Reviewed in the United States on November 11, 2023
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    Reviewed in the United States on February 28, 2024
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    Top reviews from other countries

    Elie
    5.0 out of 5 stars Works so far.
    Reviewed in Canada on February 19, 2023
    Size: Pack of 1Verified Purchase
    J. Lee C
    4.0 out of 5 stars It works! We could not believe it.
    Reviewed in Canada on September 13, 2022
    Size: Pack of 1Verified Purchase
    Customer image
    J. Lee C
    4.0 out of 5 stars It works! We could not believe it.
    Reviewed in Canada on September 13, 2022
    Tried the product on an old MDX (03) that has been leaking coolant into the passenger seat area. We've had to refill and top up twice a week. See pic, the cloth was soaking wet before adding Bar's and after idling it for 20 mins, we notice the leaking has stopped. Cooled down the car and in the morning we checked the levels of the coolant and they are still full. Test drove it again this morning for 30 mins and no leak no hissing sound when stepping on the gas.... Just a note from the Youtube mechanic Scotty, just make sure the coolant is clean. Do not use with dirty coolant, only 1/4 of the bottle was used up.
    Images in this review
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    andrew eastman
    5.0 out of 5 stars Will save you a packet
    Reviewed in Canada on December 30, 2022
    Size: Pack of 1Verified Purchase
    Nizaam
    3.0 out of 5 stars Cant verify that it did anything
    Reviewed in Canada on November 3, 2019
    Size: Pack of 1Verified Purchase
    Mark S.
    5.0 out of 5 stars Fast and effective
    Reviewed in Canada on November 1, 2021
    Size: Pack of 1Verified Purchase