Top 10 Head Gasket Sealer

Discover our curated selection of high-quality products.

Last update: 12-06-2025

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

FIX IT FAST: Our multi-purpose solution works in minutes to quickly & permanently seal leaks in the radiator, head gasket, freeze plugs, block, heater matrix & water pump. Fixes most leaks in water-cooled engines.
STOP HOLES & CRACKS: With just 1 step our unique formula will seek out each hole & crack, permanently sealing them, without any adverse impact on the efficiency of your engine cooling.
EASY TO USE: K-Seal couldn't be simpler to use & requires no draining or flushing; just shake, pour & go - shake the bottle, add the fluid to your coolant system & run your engine as normal.
VERSATILE COMPATIBILITY: Compatible with all types of antifreeze coolant. Suitable for use in both cars & light trucks with up to 12 cylinders. A permanent repair for the lifetime of the engine.
PROFESSIONAL-GRADE RELIABILITY: Trusted by mechanics, our sealer delivers a durable & long-lasting repair. A cost-effective solution to engine coolant leaks, enhancing the reliability & performance of your vehicle’s cooling system. We've sold millions worldwide & are independently verified by university testing to meet ASTM D3147.

9.7/10

Bar's Products OS-1-4PK Oil Seal (Engine Oil Burning/Leak Repair)

REPAIRS LEAKING MAIN SEALS AND GASKETS: We have designed this product to work in all gasoline and diesel engines including turbocharged, EcoBoost, hybrid and even racing engines.
RENEWS WORN VALVE SEALS AND GUIDES: Your vehicle is a good candidate for Bar’s Leaks Oil Seal Engine Oil Burning & Leak Repair if it does not consume more than one quart of oil per day.
STOPS OIL BURNING & BLUE EXHAUST SMOKE: This covers 3, 4, 5, 6, 8 and 10 cylinder engines in all cars, trucks, vans and SUV’s. Our product can also be used in heavy-duty applications referencing the appropriate dosage level.
SEAL ALL OTHER OIL LEAKS, DRIPS AND CONSUMPTION: This applies to a wide range of other motor applications too - tractors, boats, RV’s, motorcycles (including wet clutch), ATV’s, lawn equipment.
MADE IN THE USA

9.6/10

Wynn's Engine Oil Stop Leak - Prevents & Stops Oil Leaks - Restores Elasticity of Seals & O-Rings - Lubricates & Protects Engine Seals - Safe for All Engine Oils - 325ml

✅ PREVENTS AND STOPS ENGINE OIL LEAKS WITHOUT DISASSEMBLY: A powerful formulation designed to effectively stop and prevent engine oil leaks caused by the drying out and shrinking of rubber seals, neoprene rings, and O-rings. This specialised blend penetrates deeply into the affected seals, rejuvenating their structure to restore their original shape and flexibility. The product eliminates the need for costly and time-consuming mechanical repairs by sealing leaks directly within the engine system. Its advanced formula ensures long-lasting protection, preventing further leaks and maintaining engine performance at optimal levels.
✅ RESTORES ELASTICITY OF SEALS AND O-RINGS FOR LONG-LASTING PROTECTION: Formulated with advanced conditioning agents, this product actively restores the elasticity of rubber and neoprene seals, preventing premature wear and deterioration. Over time, engine seals are exposed to extreme temperatures, pressure, and contaminants, causing them to dry out, harden, and shrink, leading to leaks. This solution penetrates deeply into the molecular structure of the seals, revitalising their flexibility and resilience. The result is improved sealing capacity, reduced oil consumption, and prolonged engine life.
✅ LUBRICATES AND PRESERVES ENGINE SEALS FOR OPTIMAL PERFORMANCE: A highly effective lubricant that maintains engine seals in excellent condition by reducing friction and wear. This formula creates a protective layer around rubber and neoprene seals, preventing further cracking, drying, or brittleness due to heat and oxidation. It helps to sustain the integrity of engine components, ensuring smooth operation without interference. Unlike conventional sealants that may harden over time and reduce efficiency, this treatment keeps seals flexible and resilient, allowing them to maintain a secure fit and prevent leaks.
✅ COMPATIBLE WITH ALL MINERAL AND SYNTHETIC ENGINE OILS: Designed for versatility, this oil leak stopper is fully compatible with all types of mineral and synthetic engine oils, making it suitable for a broad range of applications. Whether used in traditional or modern low SAPS (Sulphated Ash, Phosphorus, and Sulphur) applications, it seamlessly integrates into the existing lubrication system without causing adverse effects. Its carefully balanced formula ensures it does not alter the viscosity or chemical properties of the engine oil, allowing the engine to continue running smoothly without any risk of contamination or efficiency loss.
✅ SAFE FOR ENGINES AND CATALYTIC CONVERTERS WITH NO IMPACT ON OIL PERFORMANCE: Unlike traditional oil treatments that can alter viscosity and potentially impact engine efficiency, this product preserves the original characteristics of the oil, ensuring optimal lubrication and heat management. Additionally, it is completely safe for modern engines equipped with catalytic converters, preventing any risk of contamination or damage to exhaust treatment systems. By offering a safe and effective solution for sealing oil leaks, this formulation provides peace of mind for engine maintenance while keeping the vehicle running efficiently and cleanly.

9.5/10

ProSeal Sealpro 80726 High Temperature RTV Silicone Instant Gasket, Red

LEAK PROOF GASKETS - Forms leak-proof gaskets in seconds. This special formula cures quickly to form an instant gasket when applied correctly
HIGH TEMPERATURE - Easily withstands temperatures from -56°C to 315°C continuous or up to 343°C intermittently
SAFE FOR ALL CAR MODELS - Safe to use on all car models and will not foul computer sensors
HIGH PRESSURE - Can resist pressures up to 5000psi
CHEMICAL RESISTANT - Safe to use near oils, antifreeze, grease and transmission fluid
APPLICATIONS - Aluminium, exhaust manifolds, high-temperature applications, metal, rubber and timing chain covers

9.4/10

BLUE DEVIL HEAD GASKET SEALANT

HEAD GASKET SEALER, CRACKED BLOCK, WARPED HEAD

9.2/10

Rislone 4447 Compression Repair Fix with Ring Seal - 16.5 oz.

Rislone 4447 Compression Repair Fix with Ring Seal 16.5 oz.
Brand : RISLONE
Product type: O RINGS

9.1/10

Blown Cylinder Head Gasket Fix Repair Sealer Award Winning

Steel Seal Blown Cylinder Head Gasket Fix Repair Sealer Award Winning
Brand : Steel Seal
Product type: GASKETS

8.9/10

BLUE DEVIL POUR AND GO HEAD GASKET SEALANT

Easy to Use no need for additional costs on anti freeze and flushes
Over 90% Success Rate
Permanently repairs most blown head gaskets, cracked heads, warped heads and cracked blocks

8.8/10

Bars 1830976 H1S1L-27 Head Gasket 600ml

Specially developed to restore worn seals and gaskets and stop leaks
Stops leaks in manual transmissions and ensures gaskets and seals remain flexible.
Stops transmission fluid leaks
Non-corrosive and non-clogging.

8.6/10

Nitrox Steel Weld Seal for Head Gaskets, 500 ml

PROLONG YOUR RADIATOR LIFESPAN: Contains anti-rust inhibitors to help prolong the life of radiators
PERMANENTLY REPAIR & SEAL LEAKS: Stress-Free, permanent repair for most leaks
QUICK REPAIR: Nitrox Steel Weld seals leaks in minutes, no spanners required
NO NEED TO FLUSH: This powerful formula mixes with ALL Anti-Freeze and can be added straight into the coolant system
LONG TERM PREVENTION: Steel Weld stays working, ready to repair any future leak

8.3/10

Wynn's Black Gasket Maker - Heat & Cold Resistant - Waterproof & Oil Resistant - Ideal for Engine Components & Automotive Applications - 200ml

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

Neutral RTV 100% Gasket Maker Oil and Water Resistance Anti-Freeze Remain Flexible Ultra 3 oz. High Temperature 600°F Sealant Tube

Realth Silicone Gasket Maker | 1 Pack 3.53 Oz(100g) | Ultra Black RTV | High Temperature | Oil Resistance | High Strength Flange Sealing for Automotive Machine Equipment Repairing(SG119)

Top 10 Head Gasket Sealer

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

Bar's Products OS-1-4PK Oil Seal (Engine Oil Burning/Leak Repair)

Wynn's Engine Oil Stop Leak - Prevents & Stops Oil Leaks - Restores Elasticity of Seals & O-Rings - Lubricates & Protects Engine Seals - Safe for All Engine Oils - 325ml

ProSeal Sealpro 80726 High Temperature RTV Silicone Instant Gasket, Red

BLUE DEVIL HEAD GASKET SEALANT

Rislone 4447 Compression Repair Fix with Ring Seal - 16.5 oz.

Blown Cylinder Head Gasket Fix Repair Sealer Award Winning

BLUE DEVIL POUR AND GO HEAD GASKET SEALANT

Bars 1830976 H1S1L-27 Head Gasket 600ml

Nitrox Steel Weld Seal for Head Gaskets, 500 ml

People Also Viewed

Wynn's Black Gasket Maker - Heat & Cold Resistant - Waterproof & Oil Resistant - Ideal for Engine Components & Automotive Applications - 200ml

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

Neutral RTV 100% Gasket Maker Oil and Water Resistance Anti-Freeze Remain Flexible Ultra 3 oz. High Temperature 600°F Sealant Tube

Realth Silicone Gasket Maker | 1 Pack 3.53 Oz(100g) | Ultra Black RTV | High Temperature | Oil Resistance | High Strength Flange Sealing for Automotive Machine Equipment Repairing(SG119)

Blue Hylomar Universal Gasket Jointing Compound Boxed 40g 00589

Coolant Seal Leak Repair - 250ml

Steel Seal Head Gasket Repair

Holts Sealit Leak Repair 250ml, (Packing May Vary)

K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks, 472ml

Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF

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