Radiator Stop Leak Powder – Car Cooling System Sealer 20ml

$24.64 $33.35

Seal Cooling System Leaks Quickly & Easily

Keep your engine running cool with this Radiator Stop Leak Powder — a non-toxic, fast-acting sealing compound designed to seal leaks in your car, truck, van, bus, or tractor's radiator and cooling system. Simply pour the powder in, run the engine, and let the formula do the work — no dismantling required.

Made in Mainland China.

How It Works

Formulated with a powerful blend of wood fiber, silicon dioxide, and silver powder, this stop leak powder rapidly mixes and flows throughout the entire cooling system. It forms an ultra-thin boundary sealing layer that is:

✅ High temperature resistant — holds firm under engine heat
✅ High pressure resistant — handles the demands of a pressurized cooling system
✅ Anti-vibration — maintains a lasting, durable seal
✅ Compatible with all antifreeze types — works seamlessly with your existing coolant

Key Specifications

Volume: 20ml per tube
Weight: 41g
Treatment Coverage: One tube treats cooling systems up to 3 gallons
Compatible Vehicles: Cars, trucks, vans, buses, and tractors

Important: Know What Can Be Sealed

This product is designed to seal small drip-type leaks — water escaping as drips or a slow seep. It is not suitable for large breaks where water flows out in a stream or column.

Step-by-Step Instructions

Cool the engine completely before opening the radiator cap. Opening a hot cooling system can cause serious burns.
If the cooling system is dirty or partially clogged, flush it thoroughly before use.
Pour the entire tube of powder slowly into the radiator. Add gradually to prevent clumping at high temperatures.
Fill the radiator and overflow tank to the proper level and reinstall the radiator cap.
Run the engine at a speed sufficient to circulate coolant for approximately 15 minutes, until the coolant reaches operating temperature and the leak stops.
If the leak persists, a second application may be needed. For larger leaks, catch any draining solution and pour it back into the radiator, repeating until a complete seal is achieved.
Do not change the coolant water for at least one week after treatment to allow the seal to fully cure.

⚠️ Caution

Never open the cooling system while the engine is hot or running — this may cause severe burns.
Vehicle radiators with very narrow pipes and low water flow may be prone to clogging if powder is added too quickly. Always add slowly and carefully.
Not intended for large-scale structural damage where coolant streams out forcefully.

Frequently Asked Questions

Q: Is the Radiator Stop Leak Powder safe to use with antifreeze already in the system?

A: Yes! This radiator stop leak sealer is fully compatible with all types of antifreeze and coolant mixtures. You do not need to drain your system before adding the powder — simply ensure the engine is cool, then pour the powder directly into the radiator.

Q: How long does it take for the radiator stop leak powder to seal a leak?

A: In most cases, running the engine for approximately 15 minutes after adding the powder is sufficient for the sealing compound to circulate and form a durable seal. For larger or more stubborn drip leaks, a second application may be needed.

Q: Can I use this sealer on any vehicle type?

A: This cooling system leak sealer is suitable for a wide range of vehicles including cars, trucks, vans, buses, and tractors. One 20ml tube treats cooling systems holding up to 3 gallons of coolant.

Q: What types of leaks can this product fix?

A: This radiator stop leak powder is effective on small drip-type leaks in the radiator, cylinder heads, and water jackets. It is not designed for large breaks where coolant flows out in a heavy stream or column.

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.