Top 10 Head Gasket Sealers
for June 2021

Recommendations are independently chosen by MOOZ’s editors. Purchases you make through our links may earn us a commission.

1
9.9
SCORE
BlueDevil Head Gasket Sealer (38386)

BlueDevil Products BlueDevil Head Gasket Sealer (38386)

by BlueDevil Products
What We like

Safe and easy to use

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Product Features

  • Alternative solution for costly and time consuming repairs
  • Good for Head Gaskets, Warped or Cracked Heads, Heater Cores, and Freeze Plugs
  • Permanent Repair
  • Contains no solid or particulate matter that can harm a vehicles engine

Good for head gaskets, warped or cracked heads, heater cores, and freeze plugs Alternative solution for costly and time consuming repairs Permanent repair Contains no solid or particulate matter that can harm a vehicles engine

2
9.8
SCORE
BlueDevil Pour-N-Go Head Gasket Sealer

BlueDevil Products BlueDevil Pour-N-Go Head Gasket Sealer

by BlueDevil Products
What We like

Easy to Use Pour-n-go

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Product Features

  • Used for 4 cylinder and v-6 engines
  • Do-It-Yourself Formula
  • Permanently Seals Blown, Cracked or Leaking Head Gaskets

Permanently seals blown, cracked or leaking head gaskets Used for 4 cylinder and v-6 engines Do-it-yourself formula

3
9.4
SCORE
Steel Seal Blown Head Gasket Fix Repair Sealer - 8 Cylinder

Steel Seal Blown Head Gasket Fix Repair Sealer

8 Cylinder

by Steel Seal
What We like

Used for 8 Cylinder Engines

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Product Features

  • Permanently seals a crack in the head gasket
  • Do-It-Yourself Pour in Head Gasket Fix
  • Used by thousands of repair shops nationwide

Used by thousands of repair shops nationwide Permanently seals a crack in the head gasket Do-it-yourself pour in head gasket fix

4
9.3
SCORE
Steel Seal Blown Head Gasket Fix Repair Sealer - 6 Cylinder

Steel Seal Blown Head Gasket Fix Repair Sealer

6 Cylinder

by Steel Seal
What We like

Used for 6 Cylinder Engines

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Product Features

  • Used by thousands of repair shops nationwide
  • Permanently seals a crack in the head gasket
  • Do-It-Yourself Pour in Head Gasket Fix

Used by thousands of repair shops nationwide Do-it-yourself pour in head gasket fix Permanently seals a crack in the head gasket

5
8.9
SCORE
K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz

K&W 401224 FiberLock Head Gasket & Block Repair

32 Fl Oz

by CRC
What We like

Easy Pour and Go Formula!

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Product Features

  • Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)
  • Works with all antifreeze or plain water.
  • Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads.
  • "Contains 3 unique technologies. Military-Strength Fibers create multi-layer repair over cracks with a web-like weave. Nanotechnology permanently fixes the smallest cracks and crevices. Cool-X Conditioner lowers operating temperature as it circulates through cooling system."

Seals larger holes with less fluid loss than competitive products as proven by lab test (astm d6107) "contains 3 unique technologies. military-strength fibers create multi-layer repair over cracks with a web-like weave. nanotechnology permanently fixes the smallest cracks and crevices. cool-x conditioner lowers operating temperature as it circulates through cooling system." Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads. Works with all antifreeze or plain water.

6
8.9
SCORE
Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.

Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.

by Bar's Leaks
What We like

Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps & cracks and harden to permanently stop leaks.

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Product Features

  • Repairs blown head gaskets
  • Seals cracked cylinder heads and blocks
  • Stops block leaks

Stops block leaks Repairs blown head gaskets Seals cracked cylinder heads and blocks

7
8.9
SCORE
K-Seal Coolant Leak Repair ST5516 Heavy Duty 16oz, Multi-Purpose Formula for Truck/Tractor Coolant Leaks in The Radiator, Head Gasket, Water Pump Casing & Heater Core, A True Pour & Go -Trade Trusted

K-Seal Coolant Leak Repair ST5516 Heavy Duty 16oz

Multi-Purpose Formula for Truck/Tractor Coolant Leaks in The Radiator, Head Gasket, Water Pump Casing & Heater Core, A True Pour & Go -Trade Trusted

by K-Seal
What We like

SCIENTIFICALLY TESTED: Safe and effective, our Heavy Duty Coolant stop leak repair seals leaks up to 1/32 of an inch! Once cured, it withstands the high pressure of the combustion chamber, without failing or clogging the cooling system. US Bestseller

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Product Features

  • POUR AND GO: Our cooling system sealer is easy to use just shake the bottle, add to your radiator/overflow and run the engine! Unlike some competitive products, it mixes with all types of antifreeze, no draining, flushing or pulling the thermostat required.
  • REPAIRS IN MINUTES: Create a permanent weld within the entire coolant system, including on hard plastic radiators and aluminum heads and blocks in larger capacity engines, AG, RV etc. The only industrial coolant sealant university tested to meet ASTM D3147.
  • CUSTOMER SUPPORT: If our engine coolant leak doesnt seal your head gasket, the system might be over-pressurized. Check the Technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold. Save time/money
  • SEALS CRACKS AND STOPS LEAKS: Avoid expensive downtime, our coolant stop leak will permanently seal cracks and holes! Quickly repair your head gasket, block, leaking radiator, freeze plug, heater core & water pump casing with no adverse impact on efficiency.

Seals cracks and stops leaks: avoid expensive downtime, our coolant stop leak will permanently seal cracks and holes! quickly repair your head gasket, block, leaking radiator, freeze plug, heater core & water pump casing with no adverse impact on efficiency. Repairs in minutes: create a permanent weld within the entire coolant system, including on hard plastic radiators and aluminum heads and blocks in larger capacity engines, ag, rv etc. the only industrial coolant sealant university tested to meet astm d3147. Customer support: if our engine coolant leak doesnt seal your head gasket, the system might be over-pressurized. check the technical specification section of this page for extra instructions for a successful repair. over 8 million bottles sold. save time/money Pour and go: our cooling system sealer is easy to use just shake the bottle, add to your radiator/overflow and run the engine! unlike some competitive products, it mixes with all types of antifreeze, no draining, flushing or pulling the thermostat required.

8
8.8
SCORE
Head Gasket Sealer for 4 Cylinder Engines - Steel Seal

STEEL SEAL Head Gasket Sealer for 4 Cylinder Engines

Steel Seal

by Steel Seal
What We like

Used for all 4 cylinder engines

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Product Features

  • Award winning, triple-patented formula
  • Do-It-Yourself pour in head gasket fix
  • Permanently seals head gasket leaks

Permanently seals head gasket leaks Award winning, triple-patented formula Do-it-yourself pour in head gasket fix

9
8.6
SCORE
Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair

Bar's Leaks Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair

by Bar's Leaks
What We like

Fixes leaking freeze and core plugs

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Product Features

  • Stops heater core and radiator leaks
  • Repairs blown head and intake gasket leaks
  • Seals cracked cylinder heads and blocks

Stops heater core and radiator leaks Seals cracked cylinder heads and blocks Repairs blown head and intake gasket leaks

10
8.6
SCORE
BlueDevil 32oz Head Gasket Sealer w/Radiator Flush

BlueDevil 32oz Head Gasket Sealer w/Radiator Flush

by BlueDevil Products
What We like

Includes 32oz Head Gasket sealer and 32 oz Flush

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Product Features

  • Permanently Seals Leaking Radiators
  • Permanently Seals Warped & Cracked Heads
  • Permanently Seals Blown Head Gaskets
  • Permanently Seals Leaking Heater Cores

Permanently seals warped & cracked heads Permanently seals blown head gaskets Permanently seals leaking heater cores Permanently seals leaking radiators

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