10 Best Engine Block Sealer of 2021

10 Best engine block sealer: Editor Recommended

10 Best Engine Block Sealer Reviews in 2021

SaleBestseller No. 1
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 permanently fixes the smallest cracks and crevices. Cool-X Conditioner – lowers operating temperature as it circulates...
  • Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)
  • Works with all antifreeze or plain water.
SaleBestseller No. 2
Blue Magic 1116 Liquid Glass Metallic Seal-Up - 22.8 oz.
  • Permanent cooling system sealer
  • Liquid glass and copper formula
  • Seal withstands up to 2000 degrees Fahrenheit
  • Forms permanent copper-ceramic seal
Bestseller No. 3
CRC K&W 401016 Block Seal Permanent Metallic Block & Radiator Seal -...
  • Permanent molecular seal that’s as strong as steel
  • Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores
  • 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
Bestseller No. 4
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 meeting the demands of ASTM D3147
  • 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...
Bestseller No. 5
Steel Seal Blown Head Gasket Fix Repair Sealer - 6 Cylinder
  • Permanently seals a crack in the head gasket
  • Do-It-Yourself Pour in Head Gasket Fix
  • Used by thousands of repair shops nationwide
  • Backed with a 100% Money-Back Guarantee
  • Used for 6 Cylinder Engines
Bestseller No. 6
Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop...
  • Seals larger leaks seals
  • Repairs heater core leaks
  • Repairs freeze plug leaks
  • Repairs blown head gaskets
  • Repairs blocks
Bestseller No. 7
Hi-Gear HG9048s Insta-Seal Permanent Block Sealer - 8 fl. oz.
  • Permanently repairs leaks in gaskets, radiators, heater cores, intake manifolds, blocks, heads and freeze plugs
  • Compatible with all types of antifreeze and no draining required
  • Insta-Seal fixes both large and small leaks in plastic, aluminum and cast iron intakes, heads, blocks and radiators
  • Insta-Seal will not void the manufacturer's warranty
  • Ceramic micro-fibers, copper and heat combine to "weld" both large and small cracks
SaleBestseller No. 8
Moroso 35500 Ceramic Engine Seal - 1 Pint
  • Fit type: Vehicle Specific
  • The best Chemical Sealer you can buy to stop cooling system leaks Works equally well in aluminum or cast-iron blocks Cooling system must be thoroughly clean before use Does not work with antifreeze If this doesn't stop the leaks, find yourself a welder!
  • Part number: 35500
  • Package Weight: 1.6 pounds
SaleBestseller No. 9
Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz. , Brown
  • 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 gaps & cracks and harden to permanently stop leaks.
Bestseller No. 10
K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology -...
  • Package length: 4.394 cm
  • Package width: 8.610 cm
  • Package height: 24.206 cm
  • Product Type: AUTO ACCESSORY
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