Liquid Aluminum (1186)

Liquid Aluminum


  16 Reviews

Bar’s Leaks Liquid Aluminum is part of our next-generation stop leak lineup that not only seals leaks, but also conditions the system. With this formula, you’re getting a solution to your immediate problem plus a preventive tool for avoiding future issues with heater core leaks and coolant leaks. This product also contains Xtreme Cool™, which stops overheating and significantly decreases water temperature. The combination of these two elements are guaranteed to safely and easily seal leaks in plastic, aluminum and metal radiators, heater cores, gaskets and freeze plugs.


  1. Allow engine to cool. Make sure engine is cool enough so radiator cap can be safely removed.
  2. Shake well. Pour Bar’s Leaks Liquid Aluminum directly into radiator. One bottle treats systems up to 4 gallons. Use 1/2 bottle in 3 and 4 cylinder engines. TIP: If direct access to radiator is not available, install in overflow tank.
  3. Fill radiator and overflow tank to proper level and reinstall radiator cap.
  4. Drive/idle engine for 15 to 20 minutes. If leak continues, second application may be required or mechanical attention is needed. For severe leaks, like a blown head gasket, it is recommended to use Bar’s Leaks Head Gasket Fix or Blown Head Gasket Repair.
  5. Leave Bar’s Leaks Liquid Aluminum in cooling system for continued protection.

Available at:

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Some of the best recipes only require two key ingredients to make them the favorite dish at the dinner table. We might not have professional chefs at our company, but we do have a powerful team of product engineers who constantly experiment to give you the best stop leak products in the industry. And that’s exactly what happened with our Bar’s Leaks Liquid Aluminum Cooling System Radiator and Heater Core Stop Leak.

The two key ingredients in this product are Liquid Aluminum™ and Xtreme Cool™. Liquid Aluminum™ is part of the next-generation stop leak line that not only seals leaks, but also conditions the system. When you choose Bar’s Leaks to stop coolant leaks, you’re getting a solution to your immediate problem plus a tool for avoiding future issues with heater core leaks and coolant leaks. It also contains Xtreme Cool™, which stops overheating and reduces water temperature. The mixture of these two technologies are guaranteed to safely and easily seal leaks in plastic, aluminum and metal radiators, heater cores, gaskets and freeze plugs.

Go to a mechanic for these same services and you’ll discover just how much Bar’s Leaks delivers in the way of value. A professional mechanic will charge significantly more for heater core leak repair and mitigation of coolant leaks. You’ll also have the inconvenience of finding time to take your car to the shop, get an estimate and wait for the mechanic to repair your coolant leak. It’s an inconvenience you can do without when you discover the power of Bar’s Leaks and our coolant leak repair products.

Many who use our heater core leak products are amazed by the benefits. That means that the next time you notice your radiator is leaking, all you have to do is grab one of these bottles, open the hood of your car and follow our how-to video for the quick and easy installation process. It’s time to get your show back on the road. And Bar’s Leaks can get you there by quickly, effectively and inexpensively helping you stop coolant leaks.


You use a car for convenience and transportation. Professional repairs can be inconvenient and expensive, which is why Bar’s Leaks has spent nearly 70 years developing products that fit squarely into your lifestyle and budget. Our team of award winning chemical engineers has spent decades perfecting products that stop coolant leaks, stop heater core leaks, and address a range of other automotive problems. These chemical repair solutions are proven to work, and our team is always innovating and searching for new ways to better serve today’s car owners and the latest generation of automobiles. All our products are made right here in the U.S.A., just an hour outside of Detroit. Take advantage of Bar’s Leaks products when you need to stop coolant leaks, and discover just how fast, effective and inexpensive the solutions can be.

Find out where you can get Bar’s Leaks to stop your cooling system leak today.

Customer Reviews

  16 Reviews
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 16 reviews
 by Jonathan W.

Liquid Aluminum is an excellent product. It stopped the radiator leak in my 1998 Ford Ranger 3.0 V6. There was a large puddle of coolant under my truck before using this product. It took about 30 minutes of driving for the leak to be sealed. One bottle of Liquid Aluminum was all that it took to seal the leak. Now there is no more puddle, and the coolant level in the overflow reservoir remains steady.

 by Chip
This fixed my heater core.

Hey I have 2002 Ford F-150 King Ranch that had a heater core leak that was pretty severe. I decided to give Bar's Leaks radiator and heater core stop leak a try. And what I can tell you is this, you basically need to let it run through your system for a couple of days before you actually use your heater core and allow it to penetrate all parts of your radiator system. This is the best stuff on the market that I've ever found and I'll be more than happy to tell everyone about it because it works as long as you do it the way it tells you to on the directions. Thanks Bar's for creating a great product.

 by Donald N. - Arlington, TX
You guys saved me big money

Just reporting results: $800.00 to 1000.00, saved by using your Liquid aluminum Radiator Stop Leak on my 2004 Corvette. A couple of spots were actually hairline cracks in the plastic. So far, no noticeable leaks.

 by S. K. - Santa Barbara

I decided to write to commend you for an outstanding product. I have a 2004 Pontiac Grand AM, V6 and with about 100,000 miles. About 6 months ago I had the Pontiac dealer flush the cooling system. I later noticed my car was slowly loosing coolant fluid with no evidence of a leak. At about the same time, my car developed an engine problem where it would misfire, rough idle when cold, and the "Check Engine" light would come on if I drove away too soon after starting the car. Unaware these problems were related, I had the Pontiac dealer replace the spark plugs and clean the fuel injectors per his recommendation. The problems did not go away even though I paid hundreds of dollars. To take care of the slow coolant leak, I decided to try Bar's Leaks Liquid Aluminum. To my surprise, the engine problem my car had went away the very next day, and my car is no longer loosing coolant fluid! I am totally amazed and thankful for your product! It's been two months now with my car running perfectly. After some research, it appears to me that my car's engine had some kind of a head gasket leak that got repaired by your amazing product.

 by M. K. - Mt. Hood, OR

I bought a bottle of Bar's Leaks Liquid Aluminum Radiator Seal at a local Napa store because I had a leaky water pump seal. The leak was so bad that I could only drive about ten miles before my coolant was gone and my engine would over heat. I am out of work so I really couldn't afford to get a new water pump installed. I had a 200 mile trip to make on the week end and a job interview Monday morning thinking my car was toast and I would miss everything. I bought the bars leaks liquid aluminum on the friday before, just after my car overheated so bad that I thought the head gasket would blow, and added it in the parking lot of Napa. Within minutes there were no leaks from the water pump or anywhere else. Saturday I made my 200 mile trip and stopped by on the way home at the Napa store to tell the sales person who showed me your product how great it worked. I've never been so impressed by a product that really does what it says it will do and I'm writing this to thank you for a product that really works.

 by B. B. - Pittsburgh, PA

I drive about 40,000 miles a year selling carpet for Empire. The company is great, but times are still a little tough out there. I have a 2000 Ford Tauras with 234,000 miles on it. (Bought used a few years ago.) I need my car to work and survive. A couple days ago I started getting a big blast of steam from the radiator when I stopped. I cannot afford another repair. Put your Liquid Aluiminum in today with great trepidation. Drove for 25 minutes and stopped. No steam. God bless you. Your product is awesome. I did not sleep at all last night. Now I am relaxed because of you. Thanks!!!

 by Darren S.

On our way from Phoenix, AZ in April of this year my 1987 Southwind motor home overheated and after having it checked by a mechanic was told the thermostat probably froze shut causing the engine to overheat. Also, he said the radiator and intake manifold were leaking. I asked if he could just add a sealer to the radiator to get me home since it would take a few days to fix the radiator and intake manifold. He said they had a very good commercial sealer he used before with some success. I decided to give it a try.

The next day when we left we didn’t make it to Albuquerque, NM before it overheated again. I filled the radiator with water and drove to Albuquerque looking for an auto parts store to try another sealer. I stopped at an O'’Reilly store and asked the sales person there if he had any success with the radiator sealers and he recommended your product. I put the sealer in and took off the next morning and drove all day without a problem. In fact we drove 2 more days until we got home without a problem. I was really impressed with your product and would recommend it to anyone who has a leaky radiator. I believe it was far superior to the commercial product we started with. Thanks again for your product.

 by R. P. - Newton

I had a front cover coolant leak on 20 yr old Ford van. It was in a spot so difficult it took me an hour taking stuff off to get a look at it. 1 can of heavy duty slowed it down quite a bit but didn’t stop it. I figured I had a huge repair on my hands and in desperation added I an additional can of Liquid Aluminum. The leak stopped during the first heat up cycle and has held for a week now. Your product has allowed me to keep my truck on the road as I would not be able to work on it for a few months till the weather got warm. Excellent product, I will recommend it to all.

 by M. J. - Temple Hills

Your product rocks!!!!! It works perfectly on my 1999 Corvette!! I used your product, Liquid Aluminum first before hours of labor trying to find the small slow leak. My leak is GONE!! No more drip on the garage floor. Just wanted to let you know how satisfied I am with your product. Thanks!

 by B. W.

I used your product, Bar's Leaks Liquid Aluminum, and was extremely satisfied with it. It not only saved me money, it was easy to use! GREAT PRODUCT!

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