Top 10 Best Epoxy for Plastic Radiator Repair Reviews & Buying Guide in 2022

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I bet you got your radiator broken, and now you’re looking for a solution. Don’t worry, it’s completely repairable. Since it’s a vital component that keeps the engine cool, you shouldn’t let it stay broken.

Radiator leaks are common nowadays. And that’s why the repair kits are gaining popularity.

Repairing the holes by yourself is the most affordable option. And epoxy works the best. You’ll find the best epoxy for plastic radiator repair here.

Lucky for you, we went through a total of 30 different epoxies. And then we came up with this list. We also included a buying guide and a couple of tips for you towards the end. 

best epoxy for plastic radiator repair

This solution saves money and time. You don’t have to run to the mechanic for the small leaks if you follow the process. So, let’s head on to the different reviews without any further ado. 

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Our Favorite Epoxies for Plastic Radiator Repairs

  1. Best epoxy for plastic: Versachem 90214 Radiator Repair Kit
  2. Most easy to use: Blue Magic 6522KTRI Repair Kit
  3. Best value for money: J-B Weld 8272 MarineWeld Epoxy

Quick Summary

In this overview, you’ll be able to learn about the top three choices that we recommend. But if you want further details, you’re going to have to check the reviews section. 

  • The top choice Versachem 90214 Radiator Repair Kit heals quickly. We believe that this one can shut a hairline crack up quickly. The setting time is also pretty decent. It’s the overall winner in this department. 
  • Blue Magic’s 6522KTRI Repair Kit also got a podium finish due to its ease of use. It also cures quite fast compared to the others. So we thought it deserved a shout.
  • The J-B Weld 8272 MarineWeld Epoxy was the most affordable option we chose. And it packs a punch even by being cheap. Although it takes a bit more time to cure fully, we think it redeems itself with strength.

Comparison Table

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PRODUCT DETAILS

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01

Versachem 90214 Radiator Repair Kit

  • Dimensions: ‎6.4 x 3.5 x 0.8 inches

  • Weight: ‎2.08 ounces

  • Brand: ‎Versachem

  • Model: ‎002-90214

  • Component Color: Gray

  • Compatible Surface: ‎Plastic

02

Blue Magic 6522KTRI Repair Kit

  • Dimensions: 2.99 x 0.51 x 0.51 inches

  • Weight: ‎4 ounces

  • Brand: ‎Blue Magic

  • Model: ‎Tank Repair Kit, White, 2 Oz

  • Component Color: ‎White

  • Compatible Surface: ‎Plastic

03

J-B Weld 8272 MarineWeld Epoxy

  • Dimensions: ‎8 x 5 x 1.5 inches

  • Weight: ‎2.46 ounces

  • Brand: ‎J-B Weld

  • Model: 8272

  • Component Color: ‎Dark gray

  • Compatible Surface: ‎Plastic, Composite, Wood, Metal

04

J-B Weld 8237 PlasticWeld Epoxy Putty

  • Dimensions: ‎7.5 x 3.8 x 1.19 inches

  • Weight: ‎2.4 ounces

  • Brand: ‎J-B Weld

  • Model: ‎‎JB KWIKPLASTIC

  • Component Color: Off-white

  • Compatible Surface: ‎ABS, CPVC, PVC, and plastics.

05

Jounjip Plastic Welding Repair Kit

  • Dimensions: ‎11.7 x 4.4 x 1.8 inches

  • Weight: ‎1.2 pounds

  • Brand: ‎Jounjip

  • Voltage: ‎110 Volts

  • Wattage: ‎80.00

  • Component Color: Black

  • Compatible Surface: ‎Plastic

06

J-B Weld 2120 Radiator and Plastic Repair Kit

  • Dimensions: 2 x 4 x 8 inches

  • Weight: ‎2.08 ounces

  • Brand: ‎J-B Weld

  • Model: J-B Weld 2120 Radiator and Plastic Repair Kit

  • Component Color: ‎Dark gray

  • Compatible Surface: ‎Plastics, composites, washer fluid tanks.

07

Permatex 84145 Permapoxy Plastic Weld

  • Weight: ‎0.81 ounces

  • Brand: ‎Permatex

  • Model: ‎84145

  • Component Color: Black

  • Compatible Surface: ‎Plastics, composites, ceramics.

08

Yanyi Repair Epoxy Putty Stick

  • Dimensions: 6.3 x 3.94 x 0.59 inches

  • Weight: 1.55 ounces

  • Brand: ‎Yanyi

  • Model: ‎ EB4165

  • Component Color: ‎Dark green

  • Compatible Surface: Glass, wood, metal, and hard plastics.

09

Permatex Plastic Tank Repair Kit

  • Dimensions: ‎1.08 x 6.71 x 3.4 inches

  • Weight: ‎3.2 ounces

  • Brand: ‎Permatex

  • Model: ‎09100

  • Component Color: ‎Black

  • Compatible Surface: ‎Plastic

10

PC Products 16337 Epoxy Paste

  • Dimensions: ‎2.75 x 2.75 x 5.75 inches

  • Weight: ‎12 ounces

  • Brand: ‎PC Products

  • Component Color: ‎Tan

  • Compatible Surface: Wood, plastic

Top 10 Best Epoxy for Plastic Radiator Repair Reviews

Now that you know which epoxies we’ll be talking about, let’s head into the reviews in this section.

01. Versachem 90214 Radiator Repair Kit

[Top Pick]

Versachem 90214 Radiator Repair Kit

Product Specifications:

  • Brand: ‎Versachem
  • Model: ‎002-90214
  • Component Color: Gray
  • Compatible Surface: ‎Plastic

The first one on the list is from Versachem. We tried to test this out properly, and it passed our tests quite well. 

Our thoughts? Well, it was easy to use. We didn’t need to fiddle too much with it. They said it works with both diesel and gasoline fuel tank leaks. Although we only tried them out on the gasoline one, we’ll take their word for it.

The Pros:

  • The seal is strong. You should be able to boast the seal for at least a couple of years.
  • Its temperature range is high. So no matter how hot the engine got, the radiator seal stayed intact.
  • Quick and easy to apply. The whole process took us about 20 minutes.
  • The leaks were stopped altogether. We don’t think the epoxy will melt off anytime soon.
  • Suitable for hairline cracks. It was even able to block a half-inch diameter hole. So it should be good enough for your hairline cracks.

The Cons:

  • It may not work best with polyethylene tanks. But the plastic radiators should stay safe. 
  • Struggles when bonding polypropylene. But you shouldn’t need to worry about your radiator leaking.

02. Blue Magic 6522KTRI Repair Kit

Blue Magic 6522KTRI Repair Kit

Product Specifications:

  • Brand: ‎Blue Magic
  • Model: ‎Tank Repair Kit, White, 2 Oz
  • Component Color: ‎White
  • Compatible Surface: ‎Plastic

Coming in at number two is this repair kit from Blue Magic. From a practical point of view, we think this is the easiest one to use. It’s a radiator repair epoxy kit with some ups and downs. 

This little guy shouldn’t have too much trouble trying to seal the larger cracks and leaks. We also saw that the paste works decently with gasoline. I think the same should apply to diesel fuels too.

The Pros:

  • Great for beginners because it’s easy to use. The whole package is simple, and you won’t be lost.
  • Sets quickly. Although it says it will cure in an hour, 2 hours is a more accurate representation.
  • Good water resistance. We didn’t see the seal break off after coming in contact with water.
  • There weren’t any clogs. We think that the epoxy is breathable enough for you to use it in the radiator. 
  • Fairs well in high temperatures. We measured that it even held strong at 400 degrees F. That caught us by surprise.

The Cons:

  • If the surface has any type of flex, you might see the seal breaking. But you shouldn’t try to flex your radiator in the first place.
  • It might not last over two years. But I still think it’s a big deal since it’s affordable.

03. J-B Weld 8272 MarineWeld Epoxy

J-B Weld 8272 MarineWeld Epoxy

Product Specifications:

  • Brand: ‎J-B Weld
  • Model: 8272
  • Component Color: ‎Dark gray
  • Compatible Surface: ‎Plastic, Composite, Wood, Metal

In third place, we have this MarineWeld epoxy from J-B Weld. You already know that we like this one due to its affordability. So you shouldn’t count this one out.

We tried this out on hairline cracks and a couple of leaks. Although it took a long time to cure, we think you can’t get a better deal at this price. We even heat tested this one to see whether it can handle it. Turns out it does well in around 500 degrees F too.

The Pros:

  • It’s the most affordable one on the list. For what it offers, I think even we would’ve charged more. 
  • You can get two sizes. Although they aren’t different, the cost-cutting is visible in this regard.
  • Sets in 4-6 hours. And then you have to leave it to cure. The strength is decent for the price.
  • Worked decently with plastic. We didn’t see any wear after observing for a while.
  • Works well in high temperatures. We got up to 500 degrees F, and the bond didn’t seem to break.

The Cons:

  • It takes way too long to cure. We had to leave it for a whole day. But the outcome makes it feel worth it. 
  • It’s not recommended for quick repairs. But you have other options for that.

04. J-B Weld 8237 PlasticWeld Epoxy Putty

J-B Weld 8237 PlasticWeld Epoxy Putty

Product Specifications:

  • Brand: ‎J-B Weld
  • Model: ‎‎JB KWIKPLASTIC
  • Component Color: Off-white
  • Compatible Surface: ‎ABS, CPVC, PVC, and plastics.

Here’s yet another product from J-B Weld. The PlasticWeld is different from the RadiatorWeld and the MarineWeld that we just reviewed. All three of these are close in performance. 

But this one is dedicated to plastic repairs. So, this is the one that should’ve topped the list, right? Well, it’s a bit more complicated than that.

Its heat resistance is a bit lower than the other two from the same company.

The Pros:

  • It’s easy to use, and the process is rather simple. You shouldn’t have to mess around with it too much.
  • Decent for most plastic repairs. They claim it’s great for ABS, CPVC, and PVC. But we just sealed a radiator crack.
  • It’ll set quickly. You don’t have to wait around for too long.
  • The water resistance is decent. We didn’t observe any leaks during our time of testing.
  • Works decently on semi-flexible plastic. The seal stays intact for the most part.

The Cons:

  • The temperature resistance could have been better. But we didn’t notice it melting off.
  • Takes a longer time to harden. But this shouldn’t be an issue if you’re not looking for quick fixes.

05. Jounjip Plastic Welding Repair Kit

Jounjip Plastic Welding Repair Kit

Product Specifications:

  • Brand: ‎Jounjip
  • Voltage: ‎110 Volts
  • Wattage: ‎80.00
  • Component Color: Black
  • Compatible Surface: ‎Plastic

This is a black plastic welding repair kit from Jounjip. What impressed us most is the heat resistance of the kit. It’s way higher than most of the choices on the list. 

And the versatility of the product makes it a top deal. You can use the leftover product for other projects. We were able to seal the hairline crack of our radiator decently.

The Pros:

  • The heat resistance is impressive. We managed to heat things to 500 Degrees F., and we didn’t see any problems with the seal.
  • The bond is strong enough and seals the hairline cracks on the radiator.
  • Comes with a versatile case. You can use the remaining part of the product to repair other things. 
  • Comes with a whole kit. So you don’t need to get other things to use this kit.
  • Works well with cracked fuel tanks too.

The Cons:

  • It’s on the more expensive side. But you do get a whole kit no one else gives you.
  • The tips might seem a bit weak. So you might want to look for an alternative.

06. J-B Weld 2120 Radiator & Plastic Repair Kit

J-B Weld 2120 Radiator and Plastic Repair Kit

Product Specifications:

  • Brand: ‎J-B Weld
  • Model: J-B Weld 2120 Radiator and Plastic Repair Kit
  • Component Color: ‎Dark gray
  • Compatible Surface: ‎Plastics, composites, washer fluid tanks.

Here’s another one from J-B Weld in fourth place. It’s the RadiatorWeld version of the same thing. But it comes just short of its brother, and we’ll tell you why. 

It’s supposed to be dedicated to radiator and tank repairs, but we still think the MarineWeld one worked better. Nevertheless, it’s easy to use, and you shouldn’t have too much trouble trying to fix leaks. We didn’t see anything coming off during the time of our testing.

The Pros:

  • The bond strength is decent. We didn’t see any leaks during our testing.
  • It stops the leaks by sealing them completely. Breaking the bond should be tough.
  • It’s decently easy to use. But you have to mix around a couple of components.
  • It seals hairline cracks up to almost 3/8 inches. So you can seal somewhat wider cracks too.
  • Decent for longer cracks too. We were able to seal up a four-inch-long crack.

The Cons:

  • It might run out if your crack is too big. But you can always buy extra.
  • You might need a bit of extra time to mix it. But the process is easy after mixing it.

07. Permatex 84145 Permapoxy Plastic Weld

Permatex 84145 Permapoxy Plastic Weld

Product Specifications:

  • Brand: ‎Permatex
  • Model: ‎84145
  • Component Color: Black
  • Compatible Surface: ‎Plastics, composites, ceramics.

Coming in at number 6, we have this from Permatex. This is the Permatex black plastic welder. And it has its good sides and bad ones.

The bond seemed to hold up quite well. But we were having trust issues at high temperatures. And, you might need to use other putties for the longer cracks.

The Pros:

  • It’s affordable. It’s not the cheapest on the list, but you still get a lot of performance.
  • The bond is tough with a strength of 3500 PSI. So it shouldn’t break anytime soon.
  • Sets quickly. So you don’t have to wait all night for the epoxy to heal.
  • Decent for plastic, wood, and ceramics. So it’s suitable for radiator repairs.
  • Good resistance to humidity. We didn’t see any damage upon contact with water.

The Cons:

  • Takes too long to cure. But if you don’t need a quick fix, this shouldn’t be a problem.
  • Not the best for longer hairline cracks. But works decently with the shorter ones.

08. Yanyi Repair Epoxy Putty Stick

Yanyi Repair Epoxy Putty Stick

Product Specifications:

  • Brand: ‎Yanyi
  • Model: ‎ EB4165
  • Component Color: ‎Dark green
  • Compatible Surface: Glass, wood, metal, and hard plastics.

Here we have a repair kit from Yanyi. It’s the most basic putty stick that we’re featuring here.

It’s simple, water-resistant, and easy to use. So I don’t see how you can go too wrong with this. Even the pricing isn’t too far off from the affordable ones.

After trying it out on the radiator, we were convinced that it’s an above-average option.

The Pros:

  • This one has decent water resistance. We tested it out after the epoxy set and didn’t come across any problems. 
  • They come separated and cut into 5g pieces. So prepping the pieces is an easy process.
  • Cures in around one day. That’s normal for most of the better epoxies.
  • It’s affordable, and you can use it in automotive works.
  • The adhesion is strong. It shouldn’t have any problem sticking to a surface.

The Cons:

  • Not too good in high temperatures. But it should be decent in colder regions.
  • Sticks to hands quite fast. Try to wear gloves while working with them.

09. Permatex Plastic Tank Repair Kit

Permatex Plastic Tank Repair Kit

Product Specifications:

  • Brand: ‎Permatex
  • Model: ‎09100
  • Component Color: ‎Black
  • Compatible Surface: ‎Plastic

Up next, it’s this kit from Permatex. This is the famous Permatex plastic radiator weld patch kit. It works best with plastic tanks. But we saw decent results while using this with our radiator cracks.

After fiddling with the product a bit, we think it was easier to use than the others on the list. We also found out that you can use this on the windshield washer reservoir.

The Pros:

  • Comes in two sizes. So you can pick any depending on your requirements.
  • We appreciate the fact that it’s simple to use. It was easy to follow the provided information. 
  • Sets and cures quickly. It would help if you had a cured seal in a couple of hours.
  • It’s versatile. You can use it on the windshield washer reservoir and radiator tank too. 
  • The temperature resistance is decent. We didn’t come across any clogging either.

The Cons:

  • It might cause allergic reactions to your skin. Wearing gloves is recommended. 
  • The water resistance could’ve been a bit better. But it isn’t too concerning.

10. PC Products 16337 Epoxy Paste

PC Products 16337 Epoxy Paste

Product Specifications:

  • Brand: ‎PC Products
  • Component Color: ‎Tan
  • Compatible Surface: Wood, plastic

This one is special. You won’t see the same box anywhere else on the list. Although it’s a dedicated wood repair epoxy, it worked with our radiator crack.

It has a tan tone to it. So you have to keep that in mind if you don’t plan on painting over it. The rated service temperature ranges from -20 to 200 degrees F. You have to mix the two parts to make the final epoxy paste.

The Pros:

  • You can adjust it for 30-40 minutes after application. We think that’s enough time to fix your mistakes.
  • We did not observe any clogs during our testing. So you shouldn’t have to worry about it either. 
  • It works decently on radiator hairline cracks. We did not notice any leaks after three months of testing it.
  • It’s affordable. You don’t have to spend a ton of money on it.
  • The application process is not complex. Mixing with a putty knife should be child’s play for you.

The Cons:

  • Mixing the parts with your gloves might not be a good idea. Using a putty knife is better.
  • The temperature range is a bit limited. But it’s usable for the colder regions.

Buying Guide

Now that you know about all the recommended epoxies for radiator repairs, you might be tempted to try them out. Well, as tempting as it might sound, there’s still stuff for you to do. 

Go through the following factors that you should consider before picking an J-B Weld 8272 MarineWeld Epoxy finally. 

Mixing Should Be Easy:

The first thing that you have to keep in mind is the mixing process. It should be easy since you’ll probably be doing it yourself. You will see the kits having multiple components.

And, you have to mix the elements to come up with the final product that you’ll be using. But some kits just come in a bottle. You’ll need to shake the bottle to get the mixture up and running.

For the putty-type epoxies, you might need to knead them. So, depending on the type of mixing, you have to select which one you would prefer. I mean, the bottle solution seems way more practical for the newbies if you ask me.

How Long to Seal?

The next thing you have to check is the sealing time. The seal time should be quick since your time matters. With that said, even the top-of-the-line epoxies might need more than a couple of hours to set.

The plastic holes and cracks should be shut entirely tight once the epoxy sets and seals. It’s always wise to leave the radiator overnight after applying the epoxy. 

If you buy some non-brand stuff, you might end up waiting days before the epoxy heals. So it’s best to stick with the recommended choices if you can.

If it Clogs, It’s Not the One:

Pick breathable epoxy. Since you will be using epoxy on the radiator, this is important. Your radiator helps to keep the engine cool. So it has to be breathable. 

I mean, if you pick an epoxy that doesn’t even let the radiator breathe, your engine temperatures could go crazy. And, I’m pretty sure that would make things worse. 

The epoxy components need to have enough airflow. Always pick the epoxies that have the term “non-clogging” on them. This way, you can save yourself from more expensive repairs in the future. 

How Good Is It Against water?

Well, there will be contact with water, right? I mean, you’re practically using the glue on the radiator of your car. So the epoxy must have a certain level of water resistance.

There are bad epoxies out there that come off quite quickly when they come in contact with water. Picking a water-resistant epoxy makes them last longer. Since you’re fixing a leak, it’s essential to ensure that further leaks don’t occur.

Can It Handle the Heat?

Lastly, make sure that the epoxy you get is good against high temperatures. It’s not unusual for some glues to melt right off due to crazy high temperatures. Although most epoxies heal with heat, there’s an extent to how much heat you can use.

You don’t want the epoxy to melt right out of the crack. Now, that sounds terrifying. If you end up buying the correct one, you shouldn’t have to worry about them melting off due to high heat.

Performance Rating Table

ProductSeal TimeWater ResistanceHeat Resistance
Versachem 90214 Radiator Repair Kit9.89.99.6
Blue Magic 6522KTRI Repair Kit9.79.59.7
J-B Weld 8272 MarineWeld Epoxy9.79.49.5
J-B Weld 8237 PlasticWeld Epoxy Putty9.69.59.2
Jounjip Plastic Welding Repair Kit9.59.49.4
J-B Weld 2120 Radiator and Plastic Repair Kit9.49.39.3
Permatex 84145 Permapoxy Plastic Weld9.39.29.2
Yanyi Repair Epoxy Putty Stick9.39.19.1
Permatex Plastic Tank Repair Kit9.2.8.89.0
PC Products 16337 Epoxy Paste9.18.88.9

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Any More Questions?

Here, you will find answers to the most asked questions about epoxies. If you have a question, you might find the answer here.

When should I stop applying heat?

If you’re using one-component epoxies, you need to heat them longer at higher temperatures. A suitable temperature should be around 250-300 Degrees Fahrenheit. If you heat it that high, the good kind of epoxy should start to set.

Will my epoxy expire?

The only way your epoxy repair kit will expire is if you keep them exposed to air. Keep the lid on and make sure it’s tight. If you’re careful, the components inside should stay fresh.

Will my epoxy bond last long?

If you didn’t face any goofy mishaps while applying the epoxy to your cracked radiator, you should be suitable for three years. You might see varying results depending on where you live. But it’s the average for most of the top epoxies.

Can I remove the epoxy after it sets?

Yes, you can. But you need to buy a bottle of sulfuric acid for that. This trick should be able to solve your problems.

My epoxy isn’t sticking; what can I do?

Some epoxies might give you a tough time when you’re using them on plastic. To solve this, just make sure that the Surface is clean. If there’s any oil, the epoxy won’t stick. So, ensure a good surface, and it should be fine.

Final Verdict

That’s pretty much it on our part. If you’ve gone through the whole article, you should be pretty knowledgeable by now. All the epoxies that we’ve reviewed here have their unique features. They each have their benefits and cons. So you’re the one who should decide.

Think about your budget and check which of these meets your requirements. Our top choice might not be the best epoxy for plastic radiator repair in your eyes. In that case, choose the one you like most.

If this is your first time fixing radiator leaks yourself, we recommend you take a pair of helping hands. That would make the job much easier. Till then, good luck and drive your car safely!

OUR #1 RECOMMENDATION

Versachem 90214 Radiator Repair Kit

Versachem 90214 Radiator Repair Kit

If you’re still having difficulty deciding which one is the best for you, we’ll help. The 90214 Radiator Repair Kit from Versachem checks all the boxes. It’s easy to use and heals rather quickly. So, dish out your cash for this one if you’re confused.

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