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Item #:
33426264
Bar's Leaks 1109 Liquid Copper Block Seal, 18 oz, 1-Pack | Intake and Radiator Stop Leak, One Step, Safe for All Cooling Systems
85% of respondents would recommend this to a friend
Item #:
33426264
NAD 837
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Discover the fast, effective, inexpensive power of liquid copper - our formula permanently repairs larger leaks in radiators, intake manifolds and gaskets, heater cores, blocks, heads, and freeze plugs. It will not harm the cooling system and is easy to use.
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What Stands Out
Effective Leak Sealant
Quickly seals leaks in intake systems and radiators, providing a reliable solution that improves vehicle performance and prevents costly repairs.
Easy Application
Simple to use formula that requires no tools, allowing drivers to apply it easily without professional assistance or mechanical expertise.
Versatile Compatibility
Designed for a wide range of vehicles, this product is compatible with both metal and plastic components, making it an ideal choice for various automotive needs.
Product Details
| Brand Name | Bar's Leaks |
| UPC | 046087011096 |
| Unit Count | 1 Count |
| Global Trade Identification Number | 00046087011096 |
| Number of Items | 1 |
| Included Components | 1109 Block Seal |
| Manufacturer | Bar's Leaks |
| Model | 1109 |
| Part Number | 1109 |
| Item Weight | 1.1 pounds (500 grams) |
| Item Dimensions | 7.5 x 2.6 x 2.6 inches (19.1 x 6.6 x 6.6 cm) |
| Water Resistance Level | Waterproof |
| Item Form | Liquid |
| Compatible Material | Ceramin |
| Style Name | 1 Pack |
| Surface Recommendation | Miscellaneous |
| Material Type | Sodium Silicate |
| Material | Sodium Silicate |
| Brand | Bar's Leaks |
| Style | 1 Pack |
| Item dimensions L x W x H | 7.5 x 2.6 x 2.6 inches (19.1 x 6.6 x 6.6 cm) |
| Package Weight | 2 Pound (910 grams) |
Who Should Buy?
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Minor Leaks
Ideal for users dealing with small coolant leaks in radiators or head gaskets looking for a quick fix.
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Older Vehicles
Great for owners of older vehicles that may experience wear and may benefit from a stop leak product.
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DIY Mechanics
Perfect for do-it-yourself enthusiasts seeking an easy, cost-effective solution for temporary coolant leak repairs.
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Severe Leaks
Not suitable for vehicles with large, severe leaks that require professional repair rather than a temporary solution.
Product Description
Bar's Leaks 1109 Liquid Copper Block Seal, 18 oz, 1-Pack | Intake and Radiator Stop Leak, One Step, Safe for All Cooling Systems
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Customer Questions & Answers
-
Question:
What is Bars Leaks 1109 Block Seal Liquid Copper used for?
Answer: Bars Leaks 1109 Block Seal Liquid Copper is formulated to seal leaks in the intake and radiator systems of your vehicle. It works by creating a durable seal that stays flexible, filling cracks and voids in metal, helping to prevent costly repairs or overheating due to coolant leaks. It’s particularly useful for those experiencing coolant loss or overheating issues due to minor leaks in the engine block or radiator. -
Question:
How does the Block Seal Liquid Copper work?
Answer: The Block Seal Liquid Copper functions by utilizing finely ground copper particles in its formula, which can effectively fill any small gaps or cracks in your engine and radiator. Once added to the cooling system, the liquid circulates and the copper particles will lodge themselves into the gaps, sealing them off. This ensures that your engine remains cool and operates efficiently, prolonging its lifespan and performance. -
Question:
Is the product safe to use in all vehicles?
Answer: Yes, Bars Leaks 1109 Block Seal Liquid Copper is generally safe for use in most gasoline and diesel engines, making it a versatile solution for various vehicles including cars, trucks, and SUVs. However, it’s recommended to always check the manufacturer's guidelines or consult a mechanic to ensure compatibility with your specific vehicle before use. -
Question:
How do I apply the Block Seal Liquid Copper to my vehicle?
Answer: To use Bars Leaks 1109 Block Seal Liquid Copper, start by ensuring your engine is cool and the coolant level is adequate. Shake the bottle well and pour it directly into the radiator or coolant expansion tank while the engine is running. Let the engine run for a designated timeframe as indicated on the packaging. It’s advisable to monitor the coolant levels afterward for optimal sealing. -
Question:
Can I use this product if my engine is already overheating?
Answer: While Bars Leaks 1109 Block Seal Liquid Copper can work in cases of minor leaks that may cause overheating, it's essential to first identify the cause of the overheating. If overheating is severe or ongoing, it’s best to address those issues first. This product is designed for preventative sealing or to assist in curbing leaks but is not a substitute for proper engine repairs. -
Question:
How long does the seal last after using this product?
Answer: The seal created by Bars Leaks 1109 Block Seal Liquid Copper can last for several months depending on factors such as the severity of the leak, the overall condition of your cooling system, and driving conditions. Regular maintenance and inspections are advisable to ensure that any potential leaks are monitored and do not worsen over time. -
Question:
Can I use Block Seal Liquid Copper with other coolant products?
Answer: Yes, Bars Leaks 1109 Block Seal Liquid Copper is compatible with most antifreeze and coolant mixtures. However, it's best to avoid mixing with certain sealant products to prevent any chemical interactions. If unsure, consult your vehicle's manual or a trusted mechanic for guidance to ensure compatibility and avoid adverse reactions. -
Question:
Is there a specific amount of product I should use?
Answer: For effective sealing, typically, one 18 oz. bottle of Bars Leaks 1109 Block Seal Liquid Copper is sufficient for a standard vehicle coolant system. However, larger systems may require additional product. Always refer to the instructions provided on the label for specific guidelines related to the size and need of your vehicle's cooling system. -
Question:
What should I do if the leak isn't sealed after application?
Answer: If Bars Leaks 1109 Block Seal Liquid Copper does not effectively seal the leak after application, it may indicate a larger issue that requires professional attention. It’s advisable to have your vehicle evaluated by a mechanic who can provide a thorough inspection and diagnose any significant underlying problems that may need repair beyond the capabilities of a stop leak product. -
Question:
Where can I buy Bars Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. 4 Pack?
Answer: You can purchase Bars Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. 4 Pack from Ubuy, which offers a convenient shopping experience with a wide variety of automotive products to choose from.
Bar's Leaks Radiator Editorial Review
Bar's Leaks 1109 Liquid Copper Block Seal, 18 oz, 1-Pack is a reliable solution for addressing minor radiant and intake leaks in vehicles. This one-step formula, designed for easy application, allows users to simply pour it into the cooling system and let it work its magic. Many users have praised its effectiveness, stating that it quickly sealed leaks and prevented coolant loss without the hassle of complicated processes or tools. With a generous 18 oz size, it's suitable for most vehicles and provides a heavy-duty solution compared to standard stop leak products, making it a cost-effective choice for engine maintenance.
Customer Reviews & Ratings
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Pros
- One-step formula for easy application
- Effective in sealing minor leaks
- Suitable for all cooling systems
- Generous 18 oz size for most vehicles
- Heavy-duty copper formula
- Long-lasting results reported by users
Cons
- Some users experienced delayed effectiveness after application
Platform Trust & Buyer Confidence
MA
Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
CK
Chitra
Verified buyer
“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
K
kund
Verified buyer
“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
OO
Onesi
Verified buyer
“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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SAO JOHN
Verified buyer
“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”
23 July 2026 · via Trustpilot
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Top selling Liquid Copper Block Seal in Namibia
Last Updated on August 17, 2026
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NAD 837
Order now and get it around Tuesday, September 01
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Features & Benefits
- Fast, effective, and inexpensive
- Repairs larger leaks in radiators, intake manifolds, gaskets, heater cores, blocks, heads, and freeze plugs
- Contains antifreeze-compatible sodium silicate liquid glass formula, so no draining of the cooling system is required
- Will not harm the cooling system when used properly
- Easy to use
- Permanently repairs leaks
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