Seeing your cast iron pieces breaking down is a sad yet inevitable occurrence that will invariably have you scrambling for a solution.
Just last week, when I noticed a small crack on my cast iron pan, I became disheartened. This pan saw countless breakfasts and camping trips, and I didn’t want to lose it. If not for the memories attached to it, then for its outstanding and consistent performance.
Hey there! It’s Stacy Smith back with another easy fix for you readers in a similar predicament. Finding the best epoxy for cast iron can be overwhelming, so I’ve done the research for you. Below you will find the best epoxies on the market for cast iron as well as all you need to know to pick the best one.
Let’s get right into it, shall we?
Top 5 Epoxy For Cast Iron Reviews
1. J-B Weld 8277
This hand-mixed epoxy putty stick from J-B Weld is an incredibly versatile epoxy formula. With the option to cure the epoxy on either a moist or dry surface, it can be used on a variety of materials without any problem.
Product Highlights
Where this epoxy stick shines is in its incredibly versatile surface applications. Not only does it work on metals like aluminum and bronze, but it can also be used on fiberglass, PVC, and plastic.
As for the durability of this J-B Weld epoxy stick, it can withstand temperatures of up to 300 degrees Fahrenheit. Additionally, its tensile strength is no small matter either, with an incredible shear strength of 1300 PSI. Resistance to chemicals and other hydraulic fluids rounds off the durability when it is fully cured, making this a tough and durable epoxy.
Furthermore, the application is pretty straightforward; simply knead the two formula parts by hand to begin the curing process. Once it is shaped, the epoxy will set in 25 minutes, with a complete cure within the hour. The J-B Weld WaterWeld epoxy can be used by professionals and novices alike with no problems.
What's There To Like About It?
While working with this epoxy putty stick, I found its versatile applications to be incredibly handy, especially for cast iron. The resistance to water allowed me to be more confident while shaping and applying it.
Furthermore, the epoxy is safe to come in contact with potable water once cured. So, even if the treated area on my cast iron pan comes into contact with liquids, I know it would hold up well.
What's There Not To Like About It?
Although having a thick viscosity makes this epoxy stick easy to shape, it was a challenge to work with. I recommend using gloves while mixing the putty, as it tends to stick to bare skin rather than the surface. It took some time to apply, but I could sand it properly once cured, making the issue more of a nuisance than a disadvantage.
Pros and Cons of J-B Weld 8277
Pros
Cons
- J-B Weld Waterweld: A Hand Mixable Two Part Epoxy Putty Stick, That Can Cure Under Water And Is Ideal For Repairing Plumbing, Fuel Tanks, Tubs And Showers, Drains, Pool And Spa, Boats & Potable Water Tanks And More! J-B Weld Waterweld Is Certified By The Nsf And Is Safe For Contact With Potable Water
- Cure And Set Time: After Kneading The Two Part Formula Together By Hand, Waterweld Takes 25 Minutes To Set And Cures In 1 Hour. J-B Weld Waterweld Set And Cure Color Is Off White
- Product Features And Strength: J-B Weld Waterweld Has Lap Shear Strength Of 1300 Psi, Can Withstand Continuous Temperatures Up To 300Of (149Oc) And Intermittent Temperatures Of 350Of (176 Degrees Celsius) And Is Chemical Resistant Against Petroleum, Hydraulic Fluids And Other Chemicals When Fully Cured
2. Gorilla Glue 4200130
Gorilla Glue is a common household name when it comes to adhesives. Their two-part epoxy is no exception to the easy application and uses that the brand is known for. With a simple syringe design, this epoxy is one quick and easy fix.
Product Highlights
If you are looking for a quick setting glue with a beautiful clear finish, look no further. This epoxy kit from Gorilla Glue has an incredibly rapid setting time of six minutes- more than enough time to position the surfaces for the absolute best fit.
Additionally, the syringe design of the kit makes for an easy application. Simply press the separate barrels of resin and hardener, and the appropriate ratio will be squeezed out. The solution is thick enough to fill gaps to provide solid and permanent adhesion.
As for the surfaces that the formula is compatible with, there is a wide range of materials that it can be used on. From steel and glass to ceramic tile and wood, this epoxy is sure to meet your needs. A waterproof cured surface is the cherry on the cake that provides an additional layer of durability to the surface.
What's There To Like About It?
One feature that made this epoxy a delight to use was the simple application process. I squeezed out however much formula I needed and just had to mix the two parts together- no measurement required. And I had a solid and dry epoxy surface within 30 minutes.
After the epoxy dried, I was more than satisfied with the strength on offer. Gorilla Glue rates this epoxy with up to 3300 PSI, so it’s safe to say that it won’t be going anywhere anytime soon.
What's There Not To Like About It?
Once I began mixing the epoxy and hardener, I noticed the formula gave off a strong odor right away. The smell was so strong that my husband could smell it from the other room! Other than that, I struggled to put the cap back on, as a bit of seepage dried in the nozzles.
Pros and Cons of Gorilla Glue 4200130
Pros
Cons
- Dries clear: Our Gorilla Tough epoxy resin dries clear for a clean finish and incredibly durable hold; perfect for household and automotive repairs
- 5 minute epoxy: This epoxy resin kit in just one applicator has a 5 minute set time, plenty for repositioning and adjusting
- Gap filling: Gorilla resin epoxy also acts as a gap filler, filling voids and bonding uneven or vertical surfaces
3. PC Products 25598
Designed mainly for plumbing repairs, this epoxy formula from PC Products is excellent for any metal surface. It is safe to use in areas that are in contact with potable water and can cure in wet or dry conditions.
Product Highlights
This epoxy putty from PC Products has a simple application process that also dries incredibly quickly. All you need to do is break off as much epoxy as required and knead it in your hands. Mold and apply it to the surface, and it will cure in an hour.
As this epoxy was designed for plumbing applications, it is, of course, waterproof and has a wide range of suitable temperatures. From -20 to 250 degrees Fahrenheit, this putty can surely take the heat or stay solid even in below-freezing temperatures.
Additionally, the formula has been NSF-approved as a non-toxic epoxy when cured. This means it can be used on water supply pipes or anything that comes in contact with potable water. And when cured, it has a tensile strength of up to 700 PSI and remains waterproof throughout.
What's There To Like About It?
I found the PC Products method of application to be “handy,” if you get what I mean. There were no extra tools or tubes needed to work with it. The resin and hardener are encapsulated within each other; just break off however much you need, and it’s good to mix and mold by hand.
Another helpful feature is the ability to apply it on wet and dry surfaces alike. Although it is waterproof, the formula can cure even when exposed to water, making it useful for fixing leaks.
What's There Not To Like About It?
If you need to work on an extensive repair or need a substantial amount of epoxy, you may need to get multiple packs of this epoxy. There is only two oz. in a tube, making it useful for just one-time use. Hence, I had to order a few more tubes to finish the job.
Pros and Cons of PC Products 25598
Pros
Cons
- Fast curing epoxy stick for plumbing repairs. Works on copper, PVC and steel pipe and fittings
- Approved repairs to pipes and fittings carrying potable water; return to service in less than 60 minutes
- Cures wet or dry; sand, drill and paint; continuous service temperature range from -20 to 250 degrees F
4. J-B Weld 8265S
Another great epoxy that is meant for more secure adhesion is the 8265S from J-B Weld. It’s designed as an alternative to torch welding. This should give you an idea of how strong of a bond is possible when using this epoxy formula.
Product Highlights
The 8265S epoxy formula from J-B Weld is an original formula, meaning it has incredibly strong adhesion. Once cured, the steel-reinforced mixture can hold up to 5020 PSI of tensile strength. Furthermore, it can withstand up to 550 degrees Fahrenheit, which makes for a durable and rugged epoxy surface.
Not only that, but it can also be used for materials such as ceramic, tiles, metals, and plastics, among other things. It is this versatility that makes this epoxy an excellent choice for DIY, automotive, and any other type of repairs.
Once cured, the treated surface can be cleaned up with sanding for a seamless look. Furthermore, the epoxy facilitates painting and drilling without compromising the structural integrity of the surface. However, if left as is, the epoxy dries to form a dark grey color.
What's There To Like About It?
As this is the original epoxy formula from J-B Weld, the application process is more traditional than other products. There are two separate tubes of resin and hardener that come in squeeze tubes. Moreover, it is pretty easy to work with, even for a novice like me, as I was able to eyeball the proper ratio with ease.
Additionally, the incredible durability is without question one of the best ones on the market. I had complete confidence in the bond formed no matter what I used it on.
What's There Not To Like About It?
One caveat to having such a solid bonding epoxy is the long setting and curing time involved. To set the epoxy, there is a wait time of four to six hours. As for a complete cure, you can expect anything from 16 to a full day. Patience is a significant factor to consider if you are working with this epoxy.
Pros and Cons of J-B Weld 8265S
Pros
Cons
- J-B WELD ORIGINAL: The Original Cold Weld two-part epoxy system that was designed as an alternative to torch welding. J-B Weld Original provides strong, lasting repairs to multiple surfaces and creates a bond stronger than steel. Perfect for DIY household, automotive, marine, craft repair and much more.
- CURE AND SET TIME: After mixing the tubes at a 1:1 ratio, it takes 4-6 hours to set and 15-24 hours to cure. Once cured, J-B Weld Original can be tapped, filled, sanded, molded and drilled. J-B Weld Original’s set and cure color is dark grey.
- VERSATILE & DEPENDABLE: J-B Weld Original is steel reinforced, has a tensile strength of 5020 PSI and can withstand temperatures up to 550 degrees Fahrenheit (287 degrees Celsius). When fully cured, J-B Weld Original is waterproof and resistant to petroleum, chemical and acid.
5. Yanyi EAB10H
Yanyi offers a quality epoxy formula with a syringe design that is simply a breeze to work with and apply. The medium viscosity of the formula allows it to be applied on vertical surfaces and fill gaps easily.
Product Highlights
Filling voids completely without air bubbles is a feature that should not be overlooked. And by making its way into the cracks and seams, this epoxy is able to create a strong bond. Thanks to the malleable viscosity, the formula allows up to five minutes to make adjustments for a more secure fit.
Additionally, the design of the tube makes for a straightforward application process. The combined syringes of resin and hardener give the appropriate ratio for every use. No matter your experience or familiarity with epoxy resins, this is an easy formula to work with.
Extending the functionality of this resin further is the wide range of materials it can be used on. Hard plastics and metal, as well as wood and ceramic, are just a few of the surfaces that the formula is compatible with.
What's There To Like About It?
Having a simple and straightforward application method is always a helpful feature to have in an epoxy kit. The syringe design and included plastic stirrer were especially helpful, as I can be all thumbs at times, thanks to my age.
Furthermore, the lack of air bubbles made the application process virtually hassle-free. Usually, I would have to run a hairdryer over the setting epoxy to get them out. But this kit saved me from executing that extra, and at times, annoying step.
What's There Not To Like About It?
Although this epoxy has a medium viscosity and ample working time, it needs a long period to set as well as cure. The resin needs about six hours for setting, with the full cure taking up to a day. Of course, the full bond strength is achieved in six hours, but you will need to be patient to extract the full benefits of the resin.
Pros and Cons of Yanyi EAB10H
Pros
Cons
- ✔5 minutes working time, 24 hours curing time, waterproof, sandable, paintable.
- ✔High-strength bonding, repair lasts for a long time, light and easy to apply, repeatable.
- ✔Multi-purpose quality repairs including hard plastic, metal, fiberglass, wood, ceramic, ect.
Buyers Guide
Before settling on the best epoxy for cast iron for your use, there are a few facets to consider to make sure you have the smoothest experience. Keep these factors in mind so you can make an informed purchase decision.
1. Ease Of Application
The ease of application will depend on how experienced you’re in working with epoxy resin. In this regard, you should consider how easy (or complex) it is to prepare and apply the formula to the surface according to your expertise.
One of the simplest methods of application is the syringe tube design that allows for an appropriate ratio every time. Simply squeezing the end of the syringe will give you the formula in the right proportions, and all you need to do is mix it together and apply it to the material.
Additionally, there are other straightforward methods of application, such as hand mixing. Resins that need to be hand mixed come in the form of putty and have the advantage of being moldable. Measuring out the ratio is also easy, as it can be easily adjusted if there is too much or too little resin or hardener.
For those who are more experienced, or if you are feeling confident, then a separate tube kit is a great choice as well. These kits come with the resin and hardener in individual tubes that need to be measured out in the recommended ratio. Keep in mind that every formula may need different ratios, so make sure you read the packaging thoroughly.
2. Curing Time
If time is a factor for you, then take note of how much time is needed for a full cure. Just as every resin formula varies, the amount of curing time required changes. To have the full benefits of durability and resistance, the resin needs to be cured fully.
However, a longer curing time does not necessarily mean a stronger bond. Curing times can range from an hour to a full day, so make sure you allow enough time for the curing process.
3. Tensile Strength
One of the most important factors to consider in selecting a resin is how strong it is. This strength is measured in PSI, or pound-force per square inch. What this means is how much weight it can bear per square inch of resin.
Unlike the curing time, a higher number on the PSI scale equates to a stronger bond. Typically, for items like cast iron cookware, you don’t need a higher PSI. However, having a secure and permanent bond should be the ultimate goal.
As such, finding a resin with a high PSI will give you a more secure adhesion. If your cast iron piece is prone to be subjected to pressure, then I’ll recommend going for a higher PSI. Long story short, try to find an option that can protect your cast iron surface from damages it's most prone to.
4. Temperature
In case you are looking to repair cast iron cookware, then temperature resistance is a crucial factor to be considered. Resin can melt if regularly exposed to high temperatures. As cast iron cookware is almost always exposed to heat, it is easy for any repairs to come undone.
So, don’t forget to note the range of acceptable temperatures of your resin options. Some unique formulas have also been designed to be more resistant to heat than the standard ones. These will be able to hold up well whether they are placed on a stove, oven, or campfire.
5. Quantity
Before buying a resin, you should always consider the amount or volume of the formula in the pack. As resin needs to be mixed, the actual amount available in one pack can be more than it seems.
After all, there is nothing worse than having to pause in the middle of a repair to order more resin. To avoid this from happening, always gauge how much resin you need and order accordingly. Having some leftover formula is much better than having to wait for the additional resin to arrive.
Frequently Asked Questions
Both setting and curing are essential steps in the resin application process. They allow the resin to harden to its final state and create a solid surface that has a higher resistance and durability.
On the one hand, setting time is the first stage of drying, which simply means the resin is dry to the touch. But it is not fully ready to provide the protection that is advertised on the packaging.
However, curing time refers to how long the resin needs to be completely dry to render the required durability. Waterproofing the resin, drilling into it, or painting the completed surface is possible only once the resin has been allowed to cure fully.
At the end of the day, there is no dominant application method when it comes to resin. Each method has its own benefits and disadvantages that vary on a situational basis.
Depending on what you need to use the resin on, choose a suitable application method. For example, a putty application is excellent for molding, which is much harder to achieve for a syringe application. On the other side, trying to fit putty into thin gaps is quite tricky but is something that a liquid resin formula can easily accomplish.
My Final Recommendation
Hopefully, you now know a bit more about how to fix your own cast iron. But keep in mind the various factors mentioned above to find the best epoxy for cast iron for you.
My top choice has to be the J-B Weld 8277 because it can be easily molded to fit any shape while remaining waterproof. However, if you want an easy to apply resin, then I would recommend the Gorilla Glue B01M7VD07W with the syringe design that sets fast.
No matter what resin you decide to use, one thing remains constant- using it to repair your cast iron is a simple and easy method to extend its lifespan. Treat your cast iron as well as it treats you, and make the investment today.
Take care, and until next time!