
10 Best Head Gasket Sealers
Last Updated January, 2021
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Product Highlights
arrow_forwardStops block leaks
arrow_forwardSeals cracked cylinder heads and blocks
arrow_forwardRepairs blown head gaskets
arrow_forwardContains 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.

Bar's Leaks
Bar's Leak HG-1-4PK HEAD SEAL Blown Head Gasket Repair - 33.8 oz, (Pack of 4)
More DetailsProduct Highlights
arrow_forwardRepairs blown head and intake gasket leaks
arrow_forwardSeals cracked cylinder heads and blocks
arrow_forwardStops heater core and radiator leaks
arrow_forwardFixes leaking freeze and core plugs

Product Highlights
arrow_forwardRepairs blown head and intake gasket leaks
arrow_forwardSeals cracked cylinder heads and blocks
arrow_forwardStops heater core and radiator leaks
arrow_forwardFixes leaking freeze and core plugs

K-seal
K-SEAL Ultimate Permanent Head Gasket Repair ST3501 16oz Multi-Purpose Formula Stop Leaks in the Head Gasket, Cracked/Porous Blocks, Radiator & Heater Core. A True Pour & Go, Trade Trusted Stop Leak
More DetailsProduct Highlights
arrow_forwardREPAIRS IN MINUTES: Permanently fix blown head gaskets, cracked heads and cracked/porous blocks including aluminum heads in old and new cars. The only head gasket and block sealant that is 3rd party tested to meet ASTM D3147. Save time/money
arrow_forwardSEALS CRACKS AND STOPS LEAKS: A DIY alternative to costly repairs, our head gasket fix permanently seals cracks and holes! Quickly repair your blocks, leaking radiator, freeze plug, heater core and water pump casing with no adverse impact on efficiency.
arrow_forwardPOUR AND GO: Our head gasket sealer is easy to use just shake, add to your radiator/overflow and run the engine! Unlike some competitive products, it mixes with all types of antifreeze, absolutely no draining, flushing or pulling the thermostat required.
arrow_forwardSCIENTIFICALLY TESTED: Safe, effective, our head gasket and block repair seals leaks up to 1/32 of an inch! Once cured, the repair withstands the high pressure of the combustion chamber, all without failing or clogging the cooling system. US Bestseller
arrow_forwardCUSTOMER SUPPORT: If our head gasket repair leak doesn’t seal your intake 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.

Product Highlights
arrow_forwardPermanently seals a crack in the head gasket
arrow_forwardDo-It-Yourself Pour in Head Gasket Fix
arrow_forwardUsed by thousands of repair shops nationwide
arrow_forwardBacked with a 100% Money-Back Guarantee
arrow_forwardUsed for 6 Cylinder Engines

K-seal
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
More DetailsProduct Highlights
arrow_forwardREPAIRS 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.
arrow_forwardSEALS 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.
arrow_forwardPOUR 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.
arrow_forwardSCIENTIFICALLY 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
arrow_forwardCUSTOMER SUPPORT: If our engine coolant leak doesn’t 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

Product Highlights
arrow_forwardProfessional strength fast acting resealer, stops leaks fast
arrow_forwardRejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
arrow_forwardCompatible with conventional and synthetic oils, ATF, gear oil, power steering fluids and hydraulic oil
arrow_forwardDoes not contain petroleum distillates, will not over-swell or breakdown seals
arrow_forward8oz bottle will treat a 6 quart capacity, adjust accordingly

Product Highlights
arrow_forwardDo-It-Yourself Formula
arrow_forwardEasy to Use Pour-n-go
arrow_forwardUsed for 4 cylinder and v-6 engines
arrow_forwardPermanently Seals Blown, Cracked or Leaking Head Gaskets
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