Radiator Stop Leak Concentrate


  18 Reviews

Stops and seals antifreeze/coolant leaks. Bar’s Leaks Radiator Stop Leak Concentrate is specially designed to stop minor to moderate cooling system leaks and drips caused by normal cooling system wear and age. It works with ALL types and colors of antifreeze coolant and/or water. Which is one of our commitments to customers: no matter what product you choose, our radiator stop leak or something else entirely, you can also count on effectiveness and ease-of-use.

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At Bar’s Leaks, each of our products is easy to use. There’s no special automotive expertise required. If you can pop the hood on your car, you can use our radiator sealant and other products. Each of our solutions is affordable, costing just a fraction of what you’ll spend working with a mechanic. And each of our products comes with the promise of effectiveness.

Our radiator stop leak concentrate is one of many chemical repair solutions available at Bar’s Leaks. This product is specially designed to stop minor cooling system leaks and drips caused by normal cooling system wear and age. It works with ALL types and colors of antifreeze coolant and/or water.

All you have to do is watch Bobby and Caitlin in our how-to videos and follow our easy installation process. These videos are created to make a simple-to-use product even simpler to understand and apply to your vehicle.


At Bar’s Leaks, our chemical solutions go beyond just radiator leak sealant. We also offer chemical repair solutions for problems related to cooling systems, head gaskets, engine oil, power steering, transmissions and more. As with our radiator sealer, there’s no special automotive expertise required. Each product is affordable and effective, and each works quickly — especially when compared to the cost of visiting a mechanic.

You’ll no doubt find other radiator leak sealant products, but not all of these products work as advertised. In fact, many can actually make your situation worse. At Bar’s Leaks, each of our products is the result of careful research and testing by our top-flight chemical engineers. These professionals are always improving our current products in pursuit of perfection, and they’re also constantly developing new products in response to auto manufacturer innovations and new technologies.

Made in the U.S.A., just an hour outside of Detroit, each Bar’s Leaks product is heir to a legacy nearly 70 years old. We’ve been serving everyday drivers for decades, offering special solutions that are far more convenient and far more affordable than seeking professional help at the repair shop. When you need a radiator leak sealant you can trust, choose Bar’s Leaks.

Get your radiator sealer today.

Customer Reviews

  18 Reviews
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 18 reviews
by M. K. - Boca Raton, FL on Bar's Leaks

I developed a quart a week coolant leak from my 2000 Mercury Grand Marquis. It was coming from a crack in the small coolant tower integral to the non-metallic intake manifold. These cars were subject to a class action lawsuit against Ford for this problem. I was too late to be covered for this $800 repair so I poured in half of the 10 oz. bottle of the radiator stop leak before a 700 mile trip last week. Leak stopped cold. Thanks, guys.

by D. C. - Dayton on Bar's Leaks

I heard of your products before, but never had to use it until just a few days ago while I was on the 2010 Hot Rod Power Tour. My 1968 Camaro's radiator started to leak on the tour and I thought I was done and would need to replace the radiator at a cost of around $500 before I could get back home. I purchased a bottle of your Bar's Leak radiator stop leak and almost like magic the two holes in my radiator stopped leaking. I was able to drive the car from southern Illinois to north of Minneapolis without even one drop of coolant being lost. Thanks for a wonderful product and I would suggest to anyone that is going on a trip to have a bottle of this product in their trunk for an emergency. Even if you don't use it, there maybe someone out there that just might.

by C. W. - Tacoma on Bar's Leaks

Hi, well here it goes, I drive a car that has a lot of miles, over 200 thousand on it. Well I had a leak that wasn’t huge just really bad. Well I’m not going lie about it I did use other things from homemade things to over the shelf products with good things talk about. Then I went to my local auto parts AUTO ZONE and told the clerk my problem and the clerk took me to your product. I had a lot of questions but I was told by the clerk it was the best there was for what was wrong with my car. I used it like the directions said, you can say I haven’t been happier with a product, it really did what it said WOW really WOW. My car doesn’t over heat, and it doesn’t leak! I have my car back, before I found your product, it was 3 gallons of anti freeze a month. Well in the end of things you have a great product here, this is the first time I’ve ever did a testimonial for anything. Thanks!

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