10 Best Radiator Sealants
#1
CosWarm CW4 Central Heating Leak Sealer - Treats Up to Single 18 Radiators – Leak Sealant for Boilers, Radiators & Pipes - Stops Minor Leaks & Weeps, Fixes Pressure Loss
Brand: CosWarm
$72.65
⭐ 4.7
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- STOPS SMALL LEAKS & FIXES PRESSURE LOSS: CW4 Leak Sealer seals all the small and inaccessible leaks, thus saving time and money in draining down and repairing cost. Our boiler leak sealant also helps in fixing pressure loss due to minor leaks from central heating systems.
- SUPER CONCENTRATED FORMULA: Our boiler and central heating system leak stopper can treat up to 18 single radiators, i.e., a 150-litre system. It is easy to use, just pour it in the system according to the instructions and let it work.
- HARMLESS FOR METALS: There are many leak sealant chemicals that are not friendly when they come into contact with metals. CW4 Leak Sealer liquid is suitable for use with all the metals and materials, including steel, ferrous metals, copper and aluminium.
- CONVENIENCE AT ITS BEST: Our leak sealer and stopper makes minor repairs in the boiler a breeze. It does not interfere with the working of your central heating systems and you wont have to shut down the systems before or while using it. The product can be left in the system permanently.
- SAFE FOR YOU, THE BOILERS & THE ENVIRONMENT: Our non-toxic radiator leak sealer is a safer alternative compared to other toxic, chemical formulas. As it is biodegradable, it wont harm Mother Nature either. Safe to use around people, the environment and your heating systems.
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#2
Radiator Sealant Stop Leak | Radiator Stop Leak Sealer | Permanent Waterproof Multi-Purpose Heat Resistant Car Sealant for Repair Sealing Patching Waterproofing Fix Maintenance Automotive
Brand: Generic
$19.48
⭐ 5
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- Applicable Scene: Repairs radiator pinholes and cracks while offering compatibility with multiple metal surfaces, making it ideal for use in both radiators and truck tanks for enhanced versatility
- Harsh Thermal Durability: Combats challenging temperature changes with robust resistant, supporting steady use from -40 to 180 degrees for effective radiator leak prevention over time
- Strong Protective Coating: Ensures long-lasting results through its sandable, pressure-resistant formula, offering a high-hardness coating with good bond strength on all types of curved surfaces
- Resisting Water and Oil: Resists water and oil infiltration while preserving material integrity, delivering effective sealing against harmful moisture and fluid exposure
- No Fuss Repair: Immediate sealing is achieved effortlessly via quick application, supporting fast and efficient repair processes without any reliance on pre-repair preparations
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#3
Genuine GM (12378255) Fluid 3634621 Cooling System Seal Tablet - 4 Grams, (Pack of 5)
Brand: General Motors
$22.72
⭐ 5
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- Non-toxic
- DEX-COOL compatible
- Engine application is based on liters of volume in cooling system
- Formulated for automotive use
- For use with all vehicles
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#4
Lmyit Radiator Sealant Stop Leak | Coolant Leak Repair Sealer,Permanent Waterproof Multi-Purpose Heat Resistant Car Sealant for Repair Sealing Patching Waterproofing Fix Maintenance Automotive
Brand: Lmyit
$28.09
⭐ 4.4
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- Applicable Scene: Repairs radiator pinholes and cracks while offering compatibility with multiple metal surfaces, making it ideal for use in both radiators and truck tanks for enhanced versatility
- Withstanding Harsh Thermal Changes: Provides consistent radiator leak protection by sustaining performance from -40 to 180 degrees, ensuring stability against demanding thermal shifts over extended periods
- Tough & Flexible Sealant: Combines sandable convenience and pressure resistant in a high-hardness layer, guaranteeing good bonding performance with secure adhesion tailored for curved radiator designs
- Resists Water and Oil Infiltration: Effectively seals radiator leaks by maintaining integrity and resisting water and oil, ensuring long-lasting performance against moisture and fluids without degradation
- Time-Saving Leak Fix: Fast and efficient repair is ensured with quick application, featuring immediate sealing capabilities while removing the necessity of pre-repair tasks for easy use
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#5
Rislone Radiator Stop Leak, 325 ml
Brand: Rislone
$11.21
⭐ 5
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- Stops and seals coolant leaks
- Works with any colour antifreeze
- Stops leaks and drips from wear and age
- Seals leaks in radiator, heater core and freeze plugs
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#6
K-Seal K5501 Coolant Leak Repair Treatment for Antifreeze/Engine Coolant - Suitable for Car Engines, Water Pump Casing, Heater Core & Freeze Plug
Brand: K-Seal
$33.99
⭐ 4.6
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- PERMANENT REPAIR: A permanent repair, guaranteed for the lifetime of the engine
- FIXES MOST LEAKS: Fixes most leaks in water-cooled engines
- EASY TO USE: Mixes with all types of anti-freeze + no draining or flushing
- TRUSTED BRAND: Trusted by professionals
- SCIENTIFICALLY TESTED: Scientifically tested by the Brighton University Engineering Division
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#7
Radiator Sealant Stop Leak | Engine Cooling System Sealer | Heat Resistant Multi-Purpose Permanent Waterproof Car Sealant for Fix Patching Automotive Sealing Waterproofing Repair Maintenance
Brand: Generic
$10.92
⭐ 4.1
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- Multi-Scene Applicable: Addresses pinholes and cracks in radiators and truck tanks, providing effective sealing on diverse metal surfaces to deliver consistent results in varied industrial and automotive settings
- Withstanding Harsh Thermal Changes: Provides consistent radiator leak protection by sustaining performance from -40 to 180 degrees, ensuring stability against demanding thermal shifts over extended periods
- Tough & Flexible Sealant: Combines sandable convenience and pressure resistant in a high-hardness layer, guaranteeing good bonding performance with secure adhesion tailored for curved radiator designs
- Consistent Leak Prevention: Combats leaks with sustained integrity, creating a dependable shield against water and oil intrusion to prevent fluid damage in radiator systems
- Instant Sealing Solution: Achieve immediate sealing of radiator leaks through quick application, offering a fast and efficient repair way that eliminates the need for prior repair steps
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#8
JB Weld Hi Temp Silicone Gasket Maker and Sealant, Red, 85 g
Brand: JB Weld
$12.71
⭐ 5
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- Great for oil pans, valve covers, exhaust manifolds, water pumps and timing covers
- Use on automotive, metal, and more
- Designed for use in household or mechanical assembly applications
- It will not shrink or crack, resists weathering, is sensor safe
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#9
Radiator Sealant Stop Leak - Radiator Stop Leak Sealer,Heat Resistant Multi-Purpose Permanent Waterproof Car Sealant for Fix Patching Automotive Sealing Waterproofing Repair Maintenance
Brand: Generic
$17.69
⭐ 4.1
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- Applicable Scene: Repairs radiator pinholes and cracks while offering compatibility with multiple metal surfaces, making it ideal for use in both radiators and truck tanks for enhanced versatility
- Wide Temperature Adaptability: Ensures good long-term performance by withstanding harsh thermal changes, operating effectively from -40 to 180 degrees for consistent radiator leak sealing in extreme conditions
- Resilient Surfaces Bonding: Delivers a high-hardness shield that is both sandable and resistant to pressure, creating sturdy bonds while maintaining firm adhesion on challenging curved areas of radiators
- Resisting Water and Oil: Resists water and oil infiltration while preserving material integrity, delivering effective sealing against harmful moisture and fluid exposure
- Effortless Application Process: Quick application ensures radiator leak sealer operates with immediate sealing, enabling fast and efficient repair without pre-repair preparation for optimal convenience
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#10
Radiator Sealant Stop Leak,Coolant Leak Repair Sealer | Permanent Waterproof Multi-Purpose Heat Resistant Car Sealant for Repair Sealing Patching Waterproofing Fix Maintenance Automotive
Brand: Generic
$26.99
⭐ 4.7
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- Scope Of Application: Serves as a good solution for fixing pinholes and cracks in radiators and truck tanks, suitable for an extensive range of metal surfaces for broad functional utility
- Withstanding Harsh Thermal Changes: Provides consistent radiator leak protection by sustaining performance from -40 to 180 degrees, ensuring stability against demanding thermal shifts over extended periods
- Dependable Radiator Fix: Provides a robust solution with sandable properties and good pressure resistant, forming a sturdy high-hardness layer that adheres firmly to curved radiator surfaces
- Prevent Fluid Damage: Maintains structural integrity while providing a robust barrier against moisture and fluids, offering good water and oil resistant for consistent radiator function
- Time-Saving Leak Fix: Fast and efficient repair is ensured with quick application, featuring immediate sealing capabilities while removing the necessity of pre-repair tasks for easy use
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