Top 7 Best Epoxy for Cracked Engine Block (DON’T Skip This) in 2022

A crack on your engine block, however tiny and concealed, will leak water or coolant slowing down the engine cooling cycles.

The end result is that your car’s engine may overheat or take long to warm up, problems which in turn cause the crack (s) to enlarge and the leakage to increase.

You can braze or weld the gap, but this may deform your engine block and exposes the welded area to further cracking.

The best epoxy for cracked engine block is the best way to seal the engine and get it back to optimal performance.

We tested dozens of adhesive brands so that you don’t have to waste your time and bucks on helpless trial and error.

As compensation, we’ll earn a small commission when you click on the links here and better your life with a purchase. This comes at absolutely no extra cost to you.

Best Epoxy for Cracked Engine Block Reviewed

Image
Name
Temperature rating
Price
1. J-B Weld 8265S Original Cold-Weld Steel Reinforced Epoxy, best epoxy for cracked engine block, best epoxy for aluminum engine block, best epoxy for cast iron engine block
Up to 550˚F (287˚C)
2. J-B Weld 8276 KwikWeld Quick Setting Steel Reinforced Epoxy - dark grey color, best epoxy for engine, best epoxy for cracked engine
Up to 230˚F (110˚C)
3. Blue Magic 18003 High Temperature Metal Repair, 3 oz., best epoxy to repair engine block
Up to 2400°F (1300°C)
4. PC Products 167779 PC-7 Two-Part Heavy Duty Multipurpose Epoxy Adhesive Paste, 1 lb in Two Cans, charcoal gray color, best epoxy for engine block
Up to 200°F (93.3°C)
5. Devcon 50345 Metal Patch and Fill - 3 oz., best epoxy for cast iron engine block, best epoxy for aluminum engine block
Between 40°F (4.44°C) and 400°F (204.44°C)
6. Gorilla Heavy Duty GorillaWeld Steel Bond 2-Part Epoxy, best epoxy for cracked engine
-40°F (-40°C) to 300°F (148.9°C)
7. Yanyi Moldable Epoxy Glue for Crack Damage Filling, Sealing. Permanent Repair for Metal, Glass, Wood, Plastic, Ceramics
-50°C to 120°C

1. J-B Weld 8265S Original Cold-Weld Steel Reinforced Epoxy

J-B Weld 8265S Original Cold-Weld Steel Reinforced Epoxy, best epoxy for cracked engine block, best epoxy for aluminum engine block, best epoxy for cast iron engine block

What Reviewers Like

  • Inexpensive
  • Great for all household and outdoor repair needs
  • As strong as metal when cured
  • You can paint the cured weld to a color of your liking
What they Don’t Like

  • It’s hard to remove if it sticks on unintended surfaces

2. J-B Weld 8276 KwikWeld Quick Setting Steel Reinforced Cracked Engine Block Repair Epoxy

J-B Weld 8276 KwikWeld Quick Setting Steel Reinforced Epoxy - dark grey color, best epoxy for engine, best epoxy for cracked engine

What Reviewers Like

  • Fast to set and cure
  • Great for all household and outdoor repair needs
  • Steel reinforced
What they Don’t Like

  • Lower tensile strength and temperature rating compared to J-B Original Cold Weld

3. Blue Magic 18003 QuikSteel High Temperature Metal Repair

Blue Magic 18003 High Temperature Metal Repair, 3 oz., best epoxy to repair engine block, the best way to fix hole in engine block

What Reviewers Like

  • Easy-to-use-and-store container
  • High-temperature tolerance
  • Home, outdoor and industrial applications
What they Don’t Like

  • Nothing major, except that it irritates your eyes

 

4. PC Products 167779 PC-7 Two-Part Heavy Duty Multipurpose Epoxy Adhesive Paste. Cast iron engine block repair epoxy

PC Products 167779 PC-7 Two-Part Heavy Duty Multipurpose Epoxy Adhesive Paste, 1 lb in Two Cans, charcoal gray color, best epoxy for engine block

What Reviewers Like

  • Multi-purpose use
  • Excellent resistance to chemicals
  • Best epoxy for cast iron engine block
  • Paintable for a perfect finish
What they Don’t Like

  • It does not bond to some types of plastics such as Polyethylene

5. Devcon 50345 Metal Patch and Fill

Devcon 50345 Metal Patch and Fill - 3 oz., best epoxy for cast iron engine block, best epoxy for aluminum engine block

What Reviewers Like

  • Charcoal gray color to match an engine block
  • Waterproof formula that prevents rusting/ corrosion
  • Fast setting and curing time
  • High temperature tolerance
What they Don’t Like

  • Low tensile strength

6. Gorilla Heavy Duty GorillaWeld Steel Bond 2-Part Epoxy- Best Epoxy for Aluminum Engine Block

Gorilla Heavy Duty GorillaWeld Steel Bond 2-Part Epoxy, best epoxy for cracked engine, aluminum engine block repair epoxy

What Reviewers Like

  • Thick and sticky mixture
  • Easy to use and fast drying
What they Don’t Like

  • Nothing major

7. Yanyi Epoxy Putty Stick, Moldable Epoxy Glue for Crack Damage Fixing Filling or Sealingx

Yanyi Moldable Epoxy Glue for Crack Damage Filling, Sealing. Permanent Repair for Metal, Glass, Wood, Plastic, Ceramics, best epoxy to repair engine block

What Reviewers Like

  • Great plasticity
  • Heat, water, and corrosion resistant
What they Don’t Like

  • It may irritate your skin

FAQs; Best Epoxy for Engine Block Repair

Q: Will a car start with a cracked engine block?

A: Cracks in an engine block are often tiny and difficult to spot and if that’s the case, the vehicle will always start with such a crack. However, the crack will cause the cooling system to leak and start at a much slower pace. The slow cooling cycles will cause the engine to heat up much more and faster when you’re driving, thereby enlarging the crack. This can even cause the engine to start losing water.

You don’t want such trouble and that’s why it’s important to seal anywhere you see some leakage on your engine. You can braze or weld the crack, but this may deform your engine block and exposes the welded area to further cracking. The best alternative is the best epoxy for cracked engine block.

Conclusion

Cracks in a car engine block may be tiny and difficult to spot, but they’ll leak water or coolant slowing down the engine cooling cycles. This will cause the engine to overheat or take long to warm up, in turn causing the crack (s) to enlarge and the leakage to increase. The best epoxy for a cracked engine block as reviewed in our list should have high tolerance for temperature and tensile stress. It should preferably also be applicable to multiple types of materials to fit your different needs for an adhesive.

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