Best Head Gasket Sealer For Head Gasket Leaks – Top 8 of 2021

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We looked at tons reviews, and put together a list of the best sellers. Check out the top Head Gasket Sealer For Head Gasket Leaks below.


No. 1
Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair
510 Reviews
Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair
  • Repairs blown head and intake gasket leaks
  • Seals cracked cylinder heads and blocks
  • Stops heater core and radiator leaks
  • Fixes leaking freeze and core plugs
SaleNo. 2
K-Seal ST3501 Pour and Go Permanent Head Gasket and Block Repair
44 Reviews
K-Seal ST3501 Pour and Go Permanent Head Gasket and Block Repair
  • Just Pour & Go – No Need for Expensive Head Gasket Repairs - The Safe and Easy Way to Fix a Coolant Leak
  • Fixes blown head gaskets, cracked heads and blocks
  • A permanent repair, guaranteed for the lifetime of the engine
  • Scientifically Tested - K-Seal is the only product to have been successfully tested by the equipment at Brighton University and classes as...
  • If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to...
No. 3
Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.
332 Reviews
Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.
  • Stops block leaks
  • Seals cracked cylinder heads and blocks
  • Repairs blown head gaskets
  • Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate...
SaleNo. 4
Bar's Leaks 1100 Head Gasket Repair - 20 oz.
47 Reviews
Bar's Leaks 1100 Head Gasket Repair - 20 oz.
  • Stops block leaks
  • Seals cracked cylinder heads and blocks
  • Repairs blown head gaskets
  • Dual Action 2 Part Formula — LIQUID CERAMIC: Liquid penetrates large and small leaks to form a seal actually harder than the original head...
  • Head Gasket Sealant is NOT COMPATIBLE with antifreeze and must only be added to the cooling system after ALL ANTIFREEZE has been flushed and...
No. 5
BlueDevil Head Gasket Sealer (38386)
420 Reviews
BlueDevil Head Gasket Sealer (38386)
  • Good for Head Gaskets, Warped or Cracked Heads, Heater Cores, and Freeze Plugs
  • Contains no solid or particulate matter that can harm a vehicles engine
  • Alternative solution for costly and time consuming repairs
  • Safe and easy to use
  • Permanent Repair
SaleNo. 6
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
1,082 Reviews
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
  • Permanent coolant leak repair - Just shake, pour and go
  • Mixes with all antifreeze
  • No draining or flushing
  • Fixes cracks and leaks in radiator, head gasket, freeze plugs, cylinder heads, heater core, water pump casing and engine blocks
  • If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to...
No. 7
K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz
193 Reviews
K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz
  • Easy Pour and Go Formula!
  • 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...
  • Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)
  • Works with all antifreeze or plain water.
No. 8
K-Seal Coolant Leak Repair ST5516 Heavy Duty 16oz, Multi-Purpose Formula for Truck/Tractor Coolant Leaks in The...
105 Reviews
K-Seal Coolant Leak Repair ST5516 Heavy Duty 16oz, Multi-Purpose Formula for Truck/Tractor Coolant Leaks in The...
  • REPAIRS IN MINUTES: Create a permanent weld within the entire coolant system, including on hard plastic radiators and aluminum heads and...
  • SEALS CRACKS AND STOPS LEAKS: Avoid expensive downtime, our coolant stop leak will permanently seal cracks and holes! Quickly repair your...
  • 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...
  • SCIENTIFICALLY TESTED: Safe and effective, our Heavy Duty Coolant stop leak repair seals leaks up to 1/32 of an inch! Once cured, it...
  • CUSTOMER SUPPORT: If our engine coolant leak doesn’t seal your head gasket, the system might be over-pressurized. Check the Technical...