What is Bars Leaks 1186 Liquid Aluminum Stop Leak used for?

Bars Leaks 1186 Liquid Aluminum Stop Leak is designed to seal leaks in aluminum radiator systems, engine blocks, and cylinder heads. This product works by providing a reliable seal that prevents coolant and oil leaks, thus maintaining optimal engine performance and preventing costly repairs. It's ideal for addressing minor leaks in older vehicles, allowing owners to extend the life of their engines without extensive downtime.

How does Bars Leaks 1186 Liquid Aluminum Stop Leak work?

This stop leak formula utilizes specially engineered aluminum particles that can bond with the surfaces of leaks when heated. Once injected into the cooling system, it flows to the leak site and expands as it heats up, effectively sealing the gap. This process not only stops leaks but also helps to alleviate overheating issues. It's a quick solution for those who need to manage unexpected leaks in their vehicles temporarily.

Is Bars Leaks 1186 safe for my vehicle?

Yes, Bars Leaks 1186 Liquid Aluminum Stop Leak is safe for use in most aluminum and metal engines. It's formulated to work with various coolant systems without causing damage to gaskets or seals. Always check the manufacturer's recommendations or instructions for your specific vehicle model to ensure compatibility. This product is often recommended for older vehicles where leaks can become more prevalent.

Can I use Bars Leaks 1186 in a vehicle with a coolant flush recently performed?

It's advisable to wait after a coolant flush before using Bars Leaks 1186. This allows the cooling system to fully settle and ensures that the sealant has the best chance of effectively sealing leaks. If you've recently had a flush and are experiencing leaks after, this product can be an effective temporary fix to manage leaks until more permanent repairs can be made.

How do I apply Bars Leaks 1186 Liquid Aluminum Stop Leak?

To apply Bars Leaks 1186, first ensure your engine is cool and shut off. Shake the bottle well and then pour it directly into the radiator or overflow tank, depending on the type of leak you are addressing. After installation, run the engine to circulate the product throughout the cooling system. This allows the sealant to reach the leak site, enhancing the sealing process. Always follow the manufacturer's guidelines for best results.

How long does it take for Bars Leaks 1186 to seal a leak?

Typically, Bars Leaks 1186 begins to work within minutes of application. However, for optimal results, it's recommended to run your engine for about 10-15 minutes to ensure that the product circulates effectively throughout the cooling system. For some leaks, it may take a few hours before the sealing action fully takes effect. This time frame allows the aluminum particles to bond correctly to the leak source.

What types of leaks can Bars Leaks 1186 seal?

Bars Leaks 1186 is designed to seal various types of leaks, particularly in aluminum radiators, engine blocks, and cylinder heads. This product is suitable for use in both small and moderate leaks caused by wear and tear or corrosion. It's especially useful for older vehicles facing occasional leaks in their cooling systems, providing a quick fix and helping to avoid more extensive repairs.

Can Bars Leaks 1186 be used in motorcycles or ATVs?

Yes, Bars Leaks 1186 Liquid Aluminum Stop Leak can also be used in motorcycles and ATVs that require aluminum radiator repair. It's effective for minor leaks in the cooling systems of these vehicles, providing a practical solution to manage leaks and prevent overheating. Ensure that you follow the manufacturer's recommendations regarding engine types and conditions for optimal use.

How does Bars Leaks compare to other leak stop solutions?

Bars Leaks 1186 stands out due to its aluminum sealing technology that specifically targets leaks in aluminum components. Unlike some other sealants that may be general-purpose and less effective for specific leaks, Bars Leaks offers a targeted solution that is trusted by many automotive professionals. It has a proven track record for effectively sealing leaks and providing lasting results in vehicles experiencing coolant loss.

Where can I buy Bars Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz in UK?

You can conveniently purchase Bars Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz from Ubuy in UK. Ubuy provides a reliable option for customers looking for automotive products, ensuring you can find what you need with ease and efficiency.

How to Shop Bar's Leaks Cooling System Radiator Stop Leak 16.9 Online From Ubuy?

It’s easy to shop Bar's Leaks Cooling System Radiator Stop Leak 16.9 online from Ubuy. You just have to search for the product, choose your shipping method while checking out and get it delivered to your location.

How Long Does It Take to Get Product After Placing the Order?

The delivery time of your ordered product varies as per what you've ordered and the shipping method that you've chosen. The estimated delivery time is mentioned during the checkout process, so be carefree while shopping.

Bar's Leaks

Bar's Leaks Liquid Aluminum Cooling System Stop Leak is the best radiator stop leak money can buy.

Bar's Leaks

Item #: 24291012

Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz.

89% of respondents would recommend this to a friend

Item #: 24291012

GBP 13

Price Details

Price

GBP 13

Excluding Shipping, VAT & Custom charges ( Shipping, VAT and custom charges will be calculated on checkout.
If Item price + shipping is below GBP 135, 20% VAT will be calculated on checkout, if it is equal or above GBP 135, no VAT will be charged. )

Availability : In stock

Imported from USA store

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Order now and get it around Thursday, October 29

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Bar's Leaks Liquid Aluminum Cooling System Stop Leak is the best radiator stop leak money can buy.

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What Stands Out

Fast-Acting Formula

Quickly seals leaks in radiators and cooling systems, providing immediate results to prevent further damage and reduce repair costs.

Versatile Application

Compatible with various automotive fluids, making it ideal for multiple use cases, including engines and water systems, thus catering to a broad audience.

User-Friendly Packaging

The 16.9 oz size is easy to handle and store, ensuring convenient application for both DIY enthusiasts and professional mechanics alike.

Product Details

Brand Name	Bar's Leaks
UPC	046087011867
Number of Packs	1
Item Highlight	Safely and Easily Seal Leaks in Plastic, Aluminum and Metal Radiators, Heater Cores, Gaskets, Freeze Plugs
Global Trade Identification Number	00046087011867
Number of Items	1
Included Components	1 Bottle
Item Type Name	Liquid Aluminum Radiator and Heater Core Stop Leak
Manufacturer	Bar's Leaks
Model	1186
Part Number	1186
Item Dimensions	1.8 x 3 x 6.6 inches (4.6 x 7.6 x 16.8 cm)
Item Form	Liquid
Compatible Material	Aluminum
Style Name	1 Pack
Color	Gray
Surface Recommendation	Miscellaneous
Material Type	Plastic
Material	Plastic
Brand	Bar's Leaks
Style	1 Pack
Item dimensions L x W x H	1.8 x 3 x 6.6 inches (4.6 x 7.6 x 16.8 cm)
Package Weight	2 Pound

What's in the box

1 Bottle

Who Should Buy?

Older Vehicles
Ideal for vintage cars with minor leaks in the engine or radiator to prevent overheating.
DIY Mechanic
A great option for home mechanics looking to temporarily seal small leaks without professional intervention.
Quick Fix
Perfect for individuals needing a fast solution to leaks before a long trip or during emergency situations.

Severe Leaks
Not suitable for large or gaping leaks which may require professional repair or replacement.

Product Description

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Customer Questions & Answers

Question: How to Shop Bar's Leaks Cooling System Radiator Stop Leak 16.9 Online From Ubuy?

Answer: It’s easy to shop Bar's Leaks Cooling System Radiator Stop Leak 16.9 online from Ubuy. You just have to search for the product, choose your shipping method while checking out and get it delivered to your location.
Question: Is Bar's Leaks Cooling System Radiator Stop Leak 16.9 Available to Shop Online in UK?

Answer: Yes, at Ubuy UK this product is available for you to shop at a reasonable price. The Bar's Leaks Cooling System Radiator Stop Leak 16.9 is not available locally but you can trust us with our express shipping services.
Question: How Long Does It Take to Get Product After Placing the Order?

Answer: The delivery time of your ordered product varies as per what you've ordered and the shipping method that you've chosen. The estimated delivery time is mentioned during the checkout process, so be carefree while shopping.

Bar's Leaks Fuel Leak Detectors Editorial Review

Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz. is designed to safely and effectively seal leaks in plastic, aluminum, and metal radiators. Many users have reported success, stating it worked quickly to stop small leaks, saving them costly repairs. As one user noted, after adding it to their car, the leak ceased within minutes, and coolant levels remained stable for over a week. The product is easy to use, simply requiring the addition to the radiator or overflow tank. However, it may not be as effective for larger leaks, making expectations important for optimal results. Overall, it provides a viable solution for minor radiator issues.

Customer Reviews & Ratings

4.3

3873 customers ratings

5 Star

68%
4 Star

14%
3 Star

8%
2 Star

3%
1 Star

7%

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Pros

Quickly seals small leaks in radiators
User-friendly application process
Highly effective for minor coolant seepage
Long-lasting results reported by users
Prevents overheating in vehicles

Cons

May not stop large or serious leaks effectively

Platform Trust & Buyer Confidence

4.2/5 9704 reviews

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9 September 2026 · via Trustpilot

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“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”

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“Easy to find and order what you want on the website. Delivery is quick to the UK”

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Important information

Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

GBP 13

Excluding VAT : VAT will be calculated on the checkout page

Order now and get it around Thursday, October 29

QTY:

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Features & Benefits

Scientifically formulated to permanently seal coolant leaks
Contains Xtreme Cool which stops overheating and reduces water temperature
Safely and easily seal leaks in plastic, aluminum and metal radiators
Works in cars, trucks, vans, SUV’s and RV’s
For most vehicles leaks stop in only a few minutes
Seals radiator leaks, freeze plug leaks, repairs gasket leaks and heater core leaks

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Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz.