Radiator Stop Leak Sealer Powder – Car Cooling System Repair

Seal Radiator Leaks Fast – No Dismantling Required

Keep your vehicle's cooling system running smoothly with this powerful Radiator Stop Leak Sealer Powder. Formulated with a blend of wood fiber, silicon dioxide, and silver powder, this non-toxic compound quickly circulates through your entire cooling system to locate and permanently seal small leaks in radiators, cylinder heads, and water jackets. Compatible with all types of antifreeze and suitable for cars, trucks, vans, buses, and tractors.

Made in Mainland China.

Key Features

• Fast-Acting Formula: Mixes and flows into all areas of the cooling system within 15 minutes to create an ultra-thin sealing layer.
• High-Performance Seal: Engineered for high temperature resistance, high pressure resistance, and anti-vibration durability for a lasting seal.
• Non-Toxic & Safe: Safe for use in all vehicle cooling systems; compatible with all antifreeze types.
• Wide Compatibility: Works on all car, truck, van, bus, and tractor radiators — also suitable for cracked cylinder heads and water jackets.
• No-Disassembly Application: Simple pour-in treatment — no tools or mechanical expertise required.
• One Tube Treats Up to 3 Gallons: Efficient formula makes each 41g tube go a long way.

Specifications

• Material: Wood Fiber + Silicon Dioxide + Silver Powder
• Item Weight: 41g
• Dimensions: 7.2 cm (L) × 3.9 cm (W) × 0.99 cm (H)
• Certification: RoHS Compliant
• High-Concern Chemicals: None

How to Use

1. Flush any dirty or partially clogged cooling system before use.
2. Ensure the engine is completely cool before removing the radiator cap.
3. Slowly pour the entire tube of powder into the radiator (one tube treats systems up to 3 gallons).
4. Fill the radiator and overflow tank to the proper level and reinstall the cap.
5. Run the engine at a speed sufficient to circulate the coolant for approximately 15 minutes until the coolant is hot and the leak stops.
6. If the leak persists, a second application may be required. For larger leaks, collect any escaping solution and pour it back into the radiator, repeating until a complete seal is achieved.
7. Do not replace coolant in the reservoir for at least one week after treatment.

⚠️ Important Safety Notice

Never open the cooling system while the engine is hot or running — doing so may cause severe burns. Always allow the engine to cool fully before removing the radiator cap.

Please Note: This product is designed to seal leaks where water escapes in droplet form. Leaks where water flows out in a continuous stream (column) cannot be repaired with this product. Use caution with fine or narrow coolant pipes — add the powder slowly to prevent clumping at high temperatures.

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Learn more: FuelEconomy.gov on vehicle maintenance

Frequently Asked Questions

Q: What types of vehicles is this radiator stop leak sealer powder compatible with?

A: This radiator stop leak sealer powder is compatible with all cars, trucks, vans, buses, and tractors. It works with all types of antifreeze and can also be used for cracked cylinder heads and water jackets.

Q: How long does it take for the radiator stop leak sealer powder to work?

A: After pouring the powder into the radiator and running the engine for approximately 15 minutes until the coolant reaches operating temperature, the sealing layer should form and stop the leak. For stubborn or larger leaks, a second application may be needed.

Q: Is this stop leak sealer powder safe for my cooling system?

A: Yes, the formula is non-toxic and RoHS certified with no high-concern chemicals. It is designed to be safe for use in all vehicle cooling systems when applied as directed. Always ensure the engine is cool before opening the radiator cap.

Q: Can this product fix any size radiator leak?

A: This product is effective for leaks where coolant escapes in drip or droplet form. It is not designed to repair leaks where coolant flows out in a continuous column or stream. For very large structural damage, professional mechanical repair is recommended.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.