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Item #:
221124681
K&W 401016 Block Seal Permanent MetallicTM Block & Radiator Seal - 16 Oz
Item #:
221124681
RWF 34000
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
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Imported from USA store
QTY:
Order now and get it around Saturday, August 15
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Rated No.1 Permanent molecular seal that’s as strong as steel.
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What Stands Out
Permanent Seal
K&W 401016 provides a long-lasting solution for leaks in engine blocks and radiators, ensuring durability and reliability over time, unlike temporary fixes offered by competitors.
Metallic Formula
The advanced metallic formulation creates a robust barrier against leaks, enhancing the product's ability to withstand high temperatures and pressure, making it suitable for various vehicle types.
Easy Application
Designed for user-friendly application, this 16 oz product simplifies the sealing process, saving time and effort for vehicle owners, who can achieve professional results without needing mechanical expertise.
Product Details
- Permanent molecular seal that’s as strong as steel
- Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores
- For use in all water-cooled diesel and gasoline vehicles
- Withstands extreme pressure and temperatures of a cooling system and will not wash away
- Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems
| Package Weight | 2 Pound |
Product Technical Details
| Manufacturer | CRC |
| Brand | CRC |
| Model | 401016 |
| Item Weight | 1.15 pounds |
| Product Dimensions | 5.87 x 2.31 x 2.13 inches |
| Item model number | 401016 |
| Is Discontinued By Manufacturer | No |
| Exterior | Machined |
| Manufacturer Part Number | 401016 |
What's in the box
Item
Who Should Buy?
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Leaky Radiators
Ideal for users with minor radiator leaks looking for an effective and simple fix to prevent fluid loss.
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Older Vehicles
Perfect for owners of older cars experiencing persistent small leaks that could lead to larger issues over time.
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DIY Mechanics
Great for do-it-yourself enthusiasts wanting a straightforward, non-intrusive solution to coolant leaks without major repairs.
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Severe Damage
Not suitable for vehicles with significant engine or radiator damage requiring professional or extensive repairs.
Product Description
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What is the K&W 401016 Block Seal used for?
Answer: The K&W 401016 Block Seal is designed to seal leaks in engine blocks and radiators. It works by creating a permanent bond with the metal surfaces, effectively preventing fluid loss and enhancing engine performance. This can be particularly useful for older vehicles or those with minor leaks, ensuring that you don't experience overheating or coolant loss during operation. -
Question:
Is K&W 401016 safe for all types of engines?
Answer: Yes, K&W 401016 Block Seal is formulated to be safe for use in all types of gasoline and diesel engines. It contains metallic particles that act as fillers to seal leaks without causing damage to engine components. It is ideal for both classic cars and modern vehicles, making it a versatile choice for various applications. -
Question:
How do I use the K&W 401016 Block Seal?
Answer: To use K&W 401016 Block Seal, first ensure the engine is cool and find the source of the leak. Pour the entire contents of the 16 oz bottle into the radiator or overflow tank. Then, run your engine to help circulate the product throughout the cooling system. It is crucial to follow the manufacturer's instructions on dosage and run time for optimal results. -
Question:
How long does K&W 401016 last after application?
Answer: Once applied, K&W 401016 Block Seal can provide a long-lasting seal. Its advanced formula is designed to bond permanently with metal components, effectively preventing leaks for the life of the engine. However, results can vary based on the severity of the leak and the condition of the engine. -
Question:
Can K&W 401016 Block Seal fix a blown head gasket?
Answer: K&W 401016 Block Seal is not explicitly designed to fix a blown head gasket. It may temporarily reduce symptoms related to coolant leaks, but for severe issues like a blown head gasket, a proper mechanical fix is generally required. Use this product primarily for minor leaks to prolong engine life and avoid overheating. -
Question:
Is K&W 401016 compatible with antifreeze?
Answer: Yes, K&W 401016 Block Seal can be used in systems that contain antifreeze. It is compatible with most cooling system fluids, allowing you to treat leaking radiators and blocks without needing to drain the system completely. This feature makes it a convenient option for quick repairs without disrupting ongoing maintenance. -
Question:
What are the advantages of using K&W 401016 Block Seal?
Answer: The primary advantages of K&W 401016 Block Seal include its permanent sealing capabilities, compatibility with various engine types, and ease of application. It eliminates the need for costly repairs by offering a simple, effective solution for leaks, thus improving engine reliability and performance. -
Question:
Can I use K&W 401016 on a motorcycle?
Answer: Yes, K&W 401016 Block Seal is suitable for use in motorcycles as well as cars and trucks. Its formulation works effectively to seal leaks in smaller engines, helping to maintain proper coolant levels and prevent overheating, which is essential for motorcycle performance. -
Question:
What should I do if the leak persists after using K&W 401016?
Answer: If the leak continues after using K&W 401016 Block Seal, it may indicate a more severe issue that requires professional inspection. It's advisable to consult a mechanic for a comprehensive diagnosis to determine whether a more permanent mechanical solution is needed. -
Question:
Where can I buy K&W 401016 Block Seal Permanent Metallic Block & Radiator Seal - 16 Oz?
Answer: You can buy K&W 401016 Block Seal Permanent Metallic Block & Radiator Seal - 16 Oz at Ubuy, which offers a wide range of automotive products. Ubuy provides convenient access and various purchasing options for customers in Rwanda, making it easier to find this effective leak sealant.
CRC Radiator 401016 Editorial Review
The customer experiences with this product reveal a mixed reception overall. On one hand, some users report that it effectively seals leaks in head gaskets when used correctly, highlighting the necessity of following specific instructions and preparation steps. Customers who successively drained and flushed their cooling systems before applying the product generally saw better results. For instance, one user noted that after driving the vehicle for about 75 miles post-application, the leaking had stopped. This suggests that patience and thorough adherence to a detailed method can lead to successful outcomes, particularly when leaks are minor. However, there are substantial warnings and criticisms from other users. Some reported that the product failed to perform as expected, particularly in cases of severe damage or if it was improperly used. Complaints about wasted product due to solidification before use further underscore the need for proper handling. Some customers experienced only temporary fixes, leading them to resort to more significant repairs like purchasing a new engine. Thus, while effective for minor head gasket leaks under the right conditions, the product does have limitations and may not be a long-term solution for all scenarios. **
Customer Reviews & Ratings
408 customers ratings
-
5 Star
64%
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4 Star
11%
-
3 Star
9%
-
2 Star
2%
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1 Star
14%
Review this product
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Pros
- Can effectively seal small leaks when used according to instructions.
- Positive outcomes reported after proper vehicle preparation and methodical application.
- Experienced users vouch for its effectiveness based on long-term usage.
Cons
- InConsistent results, particularly with larger or more serious leaks.
Platform Trust & Buyer Confidence
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“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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“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
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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.
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RWF 34000
Order now and get it around Saturday, August 15
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Features & Benefits
- Forms a permanent bond stronger than steel.
- Seals cracks in engine blocks, gaskets, and radiators.
- Tested by independent labs for reliability.
- Suitable for all diesel and gasoline vehicles.
- Withstands extreme pressure and temperature.
- Professional grade formula exceeds ASTM D6107.
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