Top 10 Best Engine Block Sealer For Cracked Block Based On User Rating

1. 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.

2. 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 to complete the repair successfully

3. 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

4. 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

5. K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology – 32 Fl Oz

  • Package length: 4.394 cm
  • Package width: 8.610 cm
  • Package height: 24.206 cm
  • Product Type: AUTO ACCESSORY

6. Rapid-Seal Antibacterial Wound Gel (1 Count) | Stops Bleeding in Seconds, for Minor Cuts & Scrapes

  • STOPS BLEEDING IN SECONDS | Rapid-Seal Antibacterial* Wound Gel is a clear and clean-to-apply, fast-acting way to control minor bleeding and seal minor cuts and scrapes
  • APPLIES EASILY | Non-irritating clear gel applies easily
  • FOR | Use for minor cuts & scrapes
  • DIRECTIONS | Apply enough gel to completely cover the surface area of the wound. Using a gauze pad, press and hold for approximately **30-60 seconds. Gel controls bleeding by adhering to wound and sealing it. If gel does not adhere, gently wipe off and apply new gel. Once bleeding stops, clean around the wound. This area may be covered with a sterile bandage or non-stick dressing

7. Bar’s Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak – 18 oz.

  • Seals larger leaks seals
  • Repairs heater core leaks
  • Repairs freeze plug leaks
  • Repairs blown head gaskets
  • Repairs blocks

8. 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 gasket — REINFORCED FIBERS: Fiber additives lock together with liquid to increase strength and promote a permanent seal
  • 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.
  • Included components: Unit, Instruction Guide

9. K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue

  • 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 reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully

10. CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal – 16 Oz

  • 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

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