Best Blown Head Gasket Sealer: image
Best Budget

Blue Devil Engine and Cooling Sealant is a permanent sealant that can be used to fix leaks in radiators, cracked or warped heads. The sealant has been tested on diesel engines and will not harm the engine. It also prevents oil from leaking into the fuel lines. Blue Devil’s sealing properties are non-corrosive and does not cause any damage to the engine. Notably, it was approved by the National Institute of Standards (NIST) for use in vehicles.

Honorable Mention

Cylinder heads and engine blocks. It can be used to fix leaks and cracks in radiator, head gasket, water pump casing, freeze plugs, and engine blocks. Notably, K-Seal 8 fluid ounce bottles are available at a cost of?2 lakh. The bottle has been tested under the National Institute of Standards (NIST) standards. The product is not intended for use in vehicles. However, it does have antifreeze properties.

Best Blown Head Gasket Sealer

Top 7 Best Blown Head Gasket Sealer

1
Why we chose it
  • For use in all water-cooled diesel and gasoline vehicles
  • Withstands extreme pressure and temperatures of a cooling system and will not wash away
  • Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems
  • Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores
  • Permanent molecular seal that s as strong as steel
CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz: image
84%
customers recommend this product
4.2/ 5
Value for money3.8
Easy to use3.5
2
Why we chose it
  • Seals cracks permanently
  • For use in systems up to 6 gallons
  • Engine Blocks, Radiators, Heaters, Heater Cores, Freeze Plugs
  • Seal withstands up to 2000 degrees Fahrenheit
  • Permanent cooling system sealer Liquid glass and copper formula
Blue Magic 1008-24PK Liquid Glass Metallic Seal-Up® - 11.4 oz.: image
86%
customers recommend this product
4.3/ 5
Mileage5
Easy to use4.4
Value for money4.2
3

BlueDevil 32oz Head Gasket Sealer w/Radiator Flush

170 ratings | 3 offers | 170 Reviews
Price: $64.95$64.99
Why we chose it
  • Includes 32oz Head Gasket sealer and 32 oz Flush
  • Permanently Seals Blown Head Gaskets
  • Permanently Seals Warped & Cracked Heads
  • Permanently Seals Leaking Radiators
  • Permanently Seals Leaking Heater Cores
BlueDevil 32oz Head Gasket Sealer w/Radiator Flush: image
76%
customers recommend this product
3.8/ 5
Value for money3.5
Easy to use3.2
Mileage3.1
4

STEEL SEAL SSAMZ Head Gasket Repair

176 ratings | 1 offers | 176 Reviews
Price starts from: $1
Why we chose it
  • Blown Head Gaskets
  • Steel Seal will work on all vehicles: cars, bikes, vans, pickups, 4x4s, tractors, lorries and boats.
  • All Types of Head Gasket Failure
  • Warped Cylinder Head
  • Now compatible with all types of antifreeze and any vehicle with a water cooled system
STEEL SEAL SSAMZ Head Gasket Repair: image
72%
customers recommend this product
3.6/ 5
Easy to use3.9
Mileage3.5
Value for money3.5
5

Bar’s Leaks 1100 Head Gasket Repair – 20 oz.

362 ratings | 16 offers | 362 Reviews
Price: $7.35$26.47
Why we chose it
  • Dual Action 2 Part Formula LIQUID CERAMIC: Liquid penetrates large and small leaks to form a seal actually harder than the original head gasket REINFORCED FIBERS: Fiber additives lock together with liquid to increase strength and promote a permanent seal
  • Included components: Unit, Instruction Guide
  • Head Gasket Sealant is NOT COMPATIBLE with antifreeze and must only be added to the cooling system after ALL ANTIFREEZE has been flushed and removed.
  • Stops block leaks
  • Seals cracked cylinder heads and blocks
  • Repairs blown head gaskets
Bar's Leaks 1100 Head Gasket Repair - 20 oz.: image
82%
customers recommend this product
4.1/ 5
Value for money4.3
Mileage4.3
Easy to use4
Top Pick
6

AT-205 ATP Re-Seal Leak Stopper 8 Ounce – 4 Pack

355 ratings | 5 offers | 355 Reviews
Price: $64.95$94.49
Why we chose it
    AT-205 ATP Re-Seal Leak Stopper 8 Ounce - 4 Pack: image
    92%
    customers recommend this product
    4.6/ 5
    Mileage4.7
    Value for money4.6
    7
    Why we chose it
    • Permanent coolant leak repair – Just shake, pour and go
    • Mixes with all antifreeze
    • 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 reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully
    • No draining or flushing
    K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair: image
    86%
    customers recommend this product
    4.3/ 5
    Easy to use4.6
    Value for money4.1
    Mileage3.7
    Ranking the Brands
    CRC: 14.29%
    Blue Magic: 14.29%
    BlueDevil Products: 14.29%
    STEEL SEAL: 14.29%
    Bar’s Leaks: 14.29%
    ATP: 14.29%
    K-Seal: 14.29%

    Comparison Table

    Сomparison: CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz: imageСomparison: Blue Magic 1008-24PK Liquid Glass Metallic Seal-Up® - 11.4 oz.: imageСomparison: BlueDevil 32oz Head Gasket Sealer w/Radiator Flush: imageСomparison: STEEL SEAL SSAMZ Head Gasket Repair: imageСomparison: Bar's Leaks 1100 Head Gasket Repair - 20 oz.: imageСomparison: AT-205 ATP Re-Seal Leak Stopper 8 Ounce - 4 Pack: imageСomparison: K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair: image
    CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal – 16 OzBlue Magic 1008-24PK Liquid Glass Metallic Seal-Up® – 11.4 oz.BlueDevil 32oz Head Gasket Sealer w/Radiator FlushSTEEL SEAL SSAMZ Head Gasket RepairBar’s Leaks 1100 Head Gasket Repair – 20 oz.AT-205 ATP Re-Seal Leak Stopper 8 Ounce – 4 PackK-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
    Item Weight1.15 Pounds11.3 ounces2 pounds1.32 pounds1.41 pounds1.76 ounces1 pounds
    ManufacturerCRCBlack MagicBlueDevil ProductsSteel Seal LtdBar’s LeaksK-Seal
    BrandBlue MagicSTEEL SEALATPK-Seal
    Product Dimensions2.28 x 2.28 x 5.79 inches3.15 x 1.57 x 7.87 inches1.8 x 3.4 x 8.3 inches5.9 x 4.1 x 1.9 inches
    Is Discontinued By ManufacturerNoNoNoNoYes

    Products with 5 star rating

    Tips and advices on YouTube

    HOW TO CHECK FOR A BLOWN HEAD GASKET
    How to Fix a Head Gasket Leak in Your Car
    Do Head Gasket Sealers Actually Work (FULL 2yr TEST with Engine Teardown)

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