10 Best Epoxy for Cast Iron 2021 – Top Picks & Buyer’s Guide

What is the best epoxy for cast iron? This is the question we are about to answer in this article. Cast iron is a general term for a ferrous alloy. But there are different types of cast iron such as white, grey, malleable and ductile cast iron.

They are mostly used in industrial and domestic settings. For industrial applications, cast iron is used in drainage and water piping and for domestic purpose, the frying pans in the kitchen is a good example. 

No matter the type of cast iron, they can break or get fractured sometimes. What do you do when the cast iron is broken? Do you replace it entirely or call in a professional to handle it?

Any of these options will cost you some money. But there is a solution that is very cost-effective. The solution is to use an epoxy specifically made for the fixing of cast iron.

Choosing the right epoxy with strong adhesion does not come easy with many inferior products out there. Not to worry. This article will help you in no small ways.

Here is My List of Our Favorite Products Best Epoxy for Cast Iron [Comparison Table]

PictureNamePriceBrandScore
best epoxy for cast ironJB Weld 8281
(Best Overall)
Check Price J-B Weld10
best epoxy for cast iron repairjb weld 8276Check PriceJ-B Weld 10
best epoxy for cast iron oil housingPermatex 84109Check PricePermatex 10
best epoxy for cast iron oil housing repairJB Weld 8265SCheck PriceJ-B Weld9.5
best epoxy for cast iron pipe repairJB Weld 8267Check PriceJ-B Weld 9.5
best epoxy for cast iron stripped threadsjb weld 8277Check Price J-B Weld 9.0
best epoxy for heavy cast ironGorilla 2 Part EpoxyCheck PriceGorilla 9.0
what is the best epoxy for cast ironBlue Magic 16002TRI Check PriceBlue Magic 9.0
best epoxy for cast iron oil housingJ-B Weld 37901 Check PriceJ-B Weld8.5
best epoxy for cast iron BSI BSI-202 QuickCheck Price Bob Smith8.5

1. JB Weld 8281 Professional Size Steel Reinforced Epoxy Twin Pack

best epoxy for cast iron repair

When it comes to metal-to-metal adhesion, the JB Weld 8281 stands out from the crowd. This two-part epoxy provides strong and long-lasting repairs to multiple surfaces.

When mixed at a 1:1 ratio, the epoxy forms a solid bond. It is a heavy-duty epoxy that is suitable for different applications such as automotive, concrete, brick, fiberglass, metal, marine and more.

The epoxy is capable of withstanding a temperature of up to 550 degrees Fahrenheit. It sets in just 4-6 hours. Curing takes between 15-24 hours.

This epoxy cures into dark grey colour making it easy to be sanded, painted, filed, tapped and drilled. It has a tensile strength of 5020 PSI after curing.

Features

  • Quick curing time – There is no time to waste if you need the job done pretty fast since this epoxy sets in 4-6 hours and cures in around 15-24 hours.
  • Paintable – After curing, the epoxy is not only paintable; it can also be drilled, filed, sanded, tapped, or molded. 
  • Highly versatile – This is a versatile and dependable epoxy with a tensile strength of 5020 PSI. It can be used both indoor and outdoor since it can resist temperatures up to 550 degrees Fahrenheit.
  • Perfect for different applications – The epoxy works well on different surfaces such as metal, concrete, PVC, wood, ceramics, tiles, and fiberglass.
  • Superior performance – This epoxy provides a strong and permanent bond that lasts longer than other brands of epoxy
Pros
  • Waterproof and water-resistant
  • Heavy-duty
  • Chemical and acid-resistant
  • High tensile strength
  • Repairs multiple surfaces
Cons
  • Not electrically-conductive
  • Does not bond PVC and ABS plastics

2. JB Weld 8276 KwikWeld Quick Setting Steel Reinforced Epoxy

best epoxy for cast iron oil housing

If you are looking for a way to repair metal pieces without the need for welding and soldering, the JB Weld 8276 is what you need. This is an excellent metal-to-metal epoxy with great performance.

It forms the strongest metal-to-metal bond that is long-lasting and permanent. It has a 1:1 mixing ratio to form a solid bond.

This JB Weld Epoxy is fast setting. It sets in just 6 minutes and gets fully cured in 4-6 hours. The epoxy cures into a dark grey colour. With a tensile strength of 2424 PSI, the solution is able to withstand a temperature of up to 300 degrees Fahrenheit.

After curing, it can be taped. Filed, sanded, drilled, painted and shaped.

Features

  • Waterproof – The epoxy is not affected by water making it suitable both indoor and outdoor uses
  • Acid-resistant – It is not just resistant to acid, it is also resistant to chemicals and petroleum
  • Fast setting and curing – You don’t have time to waste. It takes 6 minutes to set and 4-6 hours to cure.
  • Dark grey colour – The epoxy adhesive cures into a dark grey colour to match the metal or other materials being bonded. 
  • Surface applications – It works fine on different surfaces such as PVC, ceramics, tiles, fiberglass, plastic and metals
Pros
  • Easy to mix
  • Simple to use
  • Versatile and reliable
  • Creates a strong bond
  • Withstand high temperatures
Cons
  • It does not dry clear

3. Permatex 84109 PermaPoxy

best epoxy for cast iron oil housing repair

Permatex PermaPoxy is a 4-minute multi-metal epoxy that is very versatile and easy to use. This is a two-part epoxy that eliminates the need for soldering or welding of metal materials. It dries into a dark grey colour.

This is also a filling system for the filling of gaps without shrinking. It permanently bonds different metals such as aluminium, chrome, copper, iron, stainless steel and steel.

With 4500 PSI, this epoxy has a strong and permanent strength. It sets in just 4 minutes. It can withstand a temperature of -60 degrees to 300 degrees Fahrenheit. It can be used outdoor and indoor because it is water-resistant and resistant to solvents.

This epoxy requires no clamping to bond. It can easily be drilled, threaded, filed, sanded and painted after curing

Features

  • Versatile – This epoxy is not used for just one type of metal. It is suitable for all types of metals and other materials
  • Water-resistant – After curing, the epoxy is resistant to water and solvents.
  • Temperature-resistant – It is resistant to a temperature of between -60 degrees and 300 degrees Fahrenheit
  • Permanent bond – A permanent bond is what the epoxy provides for different surfaces at 4500 PSI tensile strength
  • Quick setting – There is no long waiting with this epoxy. The setting is in just 4 minutes and curing is in 2-4 hours.
Pros
  • No clamping
  • Easy to use and mix
  • Permanent adhesion
  • Fills gaps
  • 4500 PSI
Cons
  • Does not dry clear
  • Gets messy quickly

4. JB Weld 8265S Original Cold-Weld Steel Reinforced Epoxy

best epoxy for cast iron pipe repair

JB Weld Epoxy is a two-part epoxy system that can be used for the repair of automotive, household, marine, plumbing, crafts and agric equipment. It provides strong and long-lasting repairs to metal and multiple surfaces.

The epoxy adhesive is a two-part mixed system made for the permanent bonding of different surfaces.

It sets between 4-6 hours and fully cures in 15-24 hours. This epoxy adhesive dries into a grey colour. After curing, it can be painted, sanded, filed, shaped and tapped.

It has a tensile strength of 5020 PSI and able to resist high temperatures up to 550 degrees Fahrenheit. It is easy to mix using a 1:1 ratio.

Features

  • Multi-surface – The epoxy adhesive can be used in different applications such as metal, PVC, plastics, wood, concrete, and fibreglass.
  • Industrial strength – JB Weld 82655 has a tensile strength of 5020 PSI and it outperforms other epoxy putties
  • Versatile – This is a versatile epoxy that can be used for household repairs, plumbing, marine, automotive, crafts and many more
  • Cure and set time – When the solution is well mixed at 1:1 ratio, the setting time is just 4-6 hours while curing takes 15-24 hours.
  • Temperature-resistant – This epoxy is capable of resisting temperature up to 550 degrees Fahrenheit.
Pros
  • Waterproof
  • Easy to use and mix
  • Heavy-duty
  • Provides a strong and permanent bond
  • Chemical and acid-resistant
Cons
  • Long setting and curing time
  • Does not dry clear

5. JB Weld 8267 SteelStik Steel Reinforced Epoxy

best epoxy for cast iron stripped threads

JB Weld 8267 SteelStik is a steel reinforced epoxy putty adhesive that is used to plug holes and make repairs to wet and dry surfaces. The epoxy will still perform well even when submerged in water or gasoline.

This JB Weld Stik fully cures in 60 minutes and can easily be drilled, sanded, filed, tapped and machined after curing. It requires no tools and creates no mess.

After application, the epoxy remains pliable for 30 minutes before creating a permanent bond. It sets in 3-5 minutes and cures into a dark grey colour.

The tensile strength is 900 PSI. The epoxy can resist temperature up to 300 degrees Fahrenheit. 

Features

  • Chemical-resistant – The epoxy is chemical-resistant. It can resist hydraulic fluids, petroleum and other substances when fully cured
  • Temperature-resistant – It can be used outdoor since it can resist temperatures of up to 300 degrees Fahrenheit.
  • Versatile – This solution is useful in different ways. It is useful for automotive parts, plumbing, rust damage, household repairs and more
  • Paintable – It is paintable after curing. It can also be filed, sanded, drilled, tapped or machined when cured
  • Fast set time – Setting is in just 5 minutes and curing is in 1 hour.
Pros
  • Easy to mix
  • Strong bond
  • Industrial strength
  • Water-resistant
  • Top performance
Cons
  • The drying is not clear

6. JB Weld 8277 WaterWeld Epoxy Putty Stick

best epoxy for cast iron oil housing

The JB Weld 8277 WaterWeld is a hand mixable two-part epoxy putty stick that patches holes and cracks. JB Weld WaterWeld is called a “miracle welder”.

It is a great choice for the fixing of surfaces that are wet. This is the ideal epoxy for the rebuilding of fabrication parts.

The all-purpose adhesive is suitable for metals, fiberglass, wood, masonry, PVC, ceramics and ABS plastics. It permanently repairs holes, gouges, and cuts.

This epoxy putty stick even cures underwater. You can also use it to repair cracks in pipes carrying potable water. It works well on both porous and non-porous materials even if the surface is not dry or clean. The setting is in 15-25 minutes and curing is in an hour

Features

  • Waterproof – The WaterWeld epoxy putty is not affected by water. It can be used underwater without any issues
  • Chemical-resistant – It is not affected by contact with chemicals. This epoxy putty is also acid-resistant
  • Surface applications – JB Weld 8277 is suitable for different applications such as iron, stainless steel, brass, copper, bronze, aluminium, PVC and plastic
  • Safe to use – It is safe and healthy to use the solution on water pipes
  • Temperature-resistant – You can use the epoxy putty outdoor because it can resist temperatures up to 300 degrees Fahrenheit 
Pros
  • Works on waterbed
  • Easy to use
  • No need for clamping
  • Weather-resistant
  • Quick setting
Cons
  • It is difficult to clean

7. Gorilla 2-Part Epoxy

what is the best epoxy for cast iron

When it comes to strong epoxy adhesive, the Gorilla 2-Part is one that you can rely on. The epoxy adhesive is incredibly tough and provides a permanent bond for automotive and household repairs.

It comes in an easy-to-use syringe that separates the hardener and epoxy resin. It is used for different applications including aluminium, ceramic, tile, plastic, glass, wood, etc. 

This epoxy adhesive dries clear to match the colour of your surface or material. It is waterproof making it great for outdoor use.

The setting time is just 5 minutes which is enough time to make quick adjustments before a permanent bond. Actual curing is in 24 hours.

Features

  • Strong and permanent bond – This is a strong epoxy adhesive that gives different applications a permanent and long-lasting bond
  • Waterproof – It becomes waterproof after curing making it ideal for outdoor applications
  • Dries clear – This is a great advantage. You want the surface to match with the colour of the epoxy. The epoxy dries clear so there is no discoloration
  • Versatile – It is not just an epoxy adhesive for metal alone, it is also suitable for wood, glass, aluminium, ceramic, tile, plastics, etc
  • Temperature-resistant – The epoxy adhesive can withstand temperatures up to 500 degrees Fahrenheit
Pros
  • Strong and permanent bond
  • Great for gap-filling
  • Dries clear
  • Easy to use with a syringe
  • Sets in 5 minutes
Cons
  • Not safe for food ceramics

8. Blue Magic 16002TRI QuickSteel Steel Reinforced Epoxy Putty Repair

what is the best epoxy for cast iron

If you are looking for epoxy putty that bonds as steel, the Blue Magic QuickSteel will be a good option. It can be sanded, filed, tapped, drilled and painted once it is fully cured.

This epoxy putty is safe for drinking water. It is ideal for both indoor and outdoor use. When used outside, the epoxy putty can withstand extreme temperatures up to 500 degrees Fahrenheit.

You can also use it to fill up cracks. The epoxy putty sets in 5 minutes and cures in one hour.

Features

  • Bonds anything – The epoxy putty is capable of bonding any materials such as fibreglass, plastics, glass, ceramics and all types of metals
  • Paintable – After curing, the surface can be painted. It can also be drilled, machined, sanded, filed and tapped
  • Temperature-resistant – When cured, this epoxy putty can resist high temperatures up to 500 degrees Fahrenheit. This makes it ideal for outdoor use
  • Gasoline-resistant – It is resistant to gasoline and oil when the solution is properly cured
  • No clamping – There is no need to clamp before this epoxy putty can bond effectively.
Pros
  • Ease of use
  • Provides a strong bond like steel
  • Works on multiple applications
  • Cures into dark grey colour
  • Quick setting and curing
Cons
  • Does not bond rubber
  • It cannot be polished

9. J-B Weld 37901 ExtremeHeat

best epoxy for cast iron oil housing

This is a high-temperature resistant paste. It can withstand temperature up to 2400 degrees Fahrenheit. The metallic repair paste is able to fix steel, iron and other types of metals.

You can also use it to repair cracks, small gaps, mufflers, grills, furnaces and water heaters. When fully cured, the paste can easily be drilled, sanded or machined.

The metallic compound is water-based and non-flammable. It contains no solvents making it safe to use. 

Features

  • Ease of use – J-B Weld ExtremeHeat is easy to use and apply. It can be sanded, machines, drilled and filed after curing.
  • Resists high temperature – It resists extremely high temperature up to 2400 degrees Fahrenheit making it suitable for motorcycle and vehicle exhausts, furnaces and radiators.
  • Versatile – This is a very versatile metallic compound. It is useful in the repairs of exhaust manifolds, pipes connection, water heaters, fireboxes and mufflers
  • Safe – The product is non-flammable and made with no solvents making it safe to use
  • Dependable – This compound is highly dependable and reliable too. The heavy-duty paste restores any DIY projects once.
Pros
  • Provides strong bond
  • Incredible performance
  • Perfect for mending cracks
  • Ideal for the filling of small gaps
  • Easy to apply and use
Cons
  • It does not work on plastic and rubber

10. Bob Smith Industries BSI-201 Quik-Cure Epoxy

best epoxy for cast iron

This is a resin-based epoxy that dries clear after curing. The compound contains two bottles that need to be mixed together. Mix it 50:50 with the hardener to have the right solution. It sets in 5 minutes and cures in one hour.

The product works well but should not be subjected to water immersion. This makes it suitable for indoor use only. It is slightly flexible and warms as it cures just like many other epoxies.

The epoxy dries fast and becomes very strong after curing. This compound works great on metal-to-metal surfaces.

Features

  • Dries clear – The epoxy dries clear to blend well with any surface no matter the colour.
  • Sanded – The BSI-201 Quick-Cure Epoxy can be sanded and filed after curing.
  • Permanent bond – It provides a permanent bond to surfaces once it does not get in touch with water
  • Easy to use – It is easy to mix and apply. Just follow the instruction to get it right once. 
Pros
  • Full cure in one hour
  • Can withstand vibration or stress
  • Strong lasting bond
  • Quick setting
  • Made in the USA
Cons
  • Not friendly with water
  • It smells

How to use epoxy adhesives

  1. Select the right epoxy adhesive for your project. They are available in liquid and paste. Use the one you prefer
  2. Wear gloves and mix the epoxy adhesive. Follow the instruction on the label. 
  3. Apply the solution after mixing. Use an applicator to apply. You can use a tool pick if there is no applicator.
  4. Apply some pressure for the epoxy adhesive to properly bond the surfaces together
  5. Rub the glued surface with water and soap so it looks neat before the epoxy adhesive dries.

What is the best chemical remover for epoxy on a cast-iron tube?

Answer: Use acetone to remove uncured epoxy. For cured epoxy, use a refrigerant spray to soften it and scrape it off. You can also isopropyl alcohol. 

How can you repair cracks in cast iron?

Cast irons are not easily repairable but if it is small stuff such as a decorative item that is not exposed to vibrations, you can use an epoxy adhesive. Another way is to mend it down to the end and recast. If it is an industrial crack, then, welding is the best solution.

Which best epoxy for cast iron should you choose? 

Answer: We recommend J-B Weld Epoxy

Buyer’s guide

Choosing the best epoxy for cast iron can be complicated. As such, there are some factors you must consider before you choose the right epoxy for your materials, surfaces or objects. Here are things you must consider to choose the right epoxy.

Bond time

This is one of the vital considerations to make whenever you want to choose an epoxy. Epoxy adhesives have different drying and curing time.

If you need the project to cure pretty quickly, an epoxy that cures in 48 hours won’t be an ideal choice. Some cure in one hour or more while others cure in 24 hours or more.

If you are choosing a fast curing epoxy, ensure you are not compromising on the strength of the bond.

Waterproof and temperature-resistant

You should consider the environment where you expose the materials. If the materials are exposed outside, you must ensure the epoxy adhesive you want to use is waterproof and water-resistant.

Some epoxies collapse due to exposure to water. Temperature is another thing to consider. Choose an epoxy that can resist high temperatures. It is recommended you choose a compound that can withstand up to 300 to 500 degrees Fahrenheit.

Bottle size

Look at the size of your project. If you are handling a large project, going for a smaller size may not be economical and cost-effective. In this case, you will need a larger size. But do not compromise quality for quantity.

Ease of use

The epoxy adhesive should be easy to use and mix especially if it is a two-part epoxy. You don’t want an epoxy that is messy with pungent smells. The epoxy should easily be sanded, filed, machined, painted or drilled

Safe to use

Choose an epoxy that is water-safe and food-safe. Also, ensure that it is free from solvents.

Conclusion

Choosing the right epoxy adhesive will depend on the project you have at hand. You can make a good choice by choosing from our best epoxy for cast iron review. Any product that you choose is tested and trusted. Determine how strong you want the bond by looking for a product with high PSI and temperature-resistant.

We recommend any of the J-B Weld epoxy adhesives in case you are having difficulty making a choice.

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