Can you fix a plastic radiator with JB Weld?

Asked By: Maximiana Vilamala | Last Updated: 24th June, 2020
Category: home and garden home appliances
4.5/5 (1,607 Views . 20 Votes)
Fixing a hairline crack on a plastic radiator in 15 minutes, for under $15.00. Using: JB Weld Epoxy. This is a quick-fix and should be used only as a temporary solution.

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Consequently, will JB Weld work on a plastic radiator?

JB Weld, no matter how good it is, will not withstand the coolant, the heat and the pressure inside your radiator.

Also, can you repair plastic radiators? The only true way to patch a plastic radiator tank is with a true fusion weld. The Radiator Repair Kit enables you to melt pure nylon fill material directly into the base material, creating a seamless, strong repair that will last for the long haul.

Likewise, people ask, how do you fix a radiator with JB Weld?

How to Repair a Radiator With J-B WELD

  1. Drain your radiator.
  2. Clean the area where the leak is located thoroughly.
  3. Mix the J-B WELD.
  4. Apply your mixed J-B WELD all over the leak area liberally with the wooden tool.
  5. Replace the radiator plug on the bottom of the radiator and refill the fluid to the appropriate level.

How do you fix a radiator leak with epoxy?

How to Patch a Radiator Leak With Epoxy

  1. Drain the radiator.
  2. Thoroughly clean the radiator around the leak. Failing to do so will prevent the epoxy from adhering.
  3. Apply a cold weld epoxy to the radiator. Epoxies vary, so be sure to follow the directions on the epoxy package for prepping and applying the epoxy.
  4. Allow the epoxy to cure.
  5. Refill the radiator.

30 Related Question Answers Found

Can you fix a hole in a radiator?

Pinhole sized leaks in the radiator can be temporarily repaired with a radiator sealant product such as Alum-A-Seal or Bar's Leak. These products and similar products are available at auto parts stores. Allow the engine to cool down. Remove the radiator cap and empty the contents of the sealant into the radiator.

How do you fix a crack in a metal radiator?

Seal visible cracks with epoxy.
If you are able to locate a crack in your radiator, you may be able to repair it using an epoxy. First clean the area around the crack thoroughly, as any dirt or grease may prevent the epoxy from establishing a seal.

Can you JB weld aluminum radiator?

The J-B Weld is the perfect aluminum welding solution. It is to be mixed with alcohol that acts as a thinner. This mixture than has to be poured into the damaged areas of the radiator. The welded area then has to be heated with the help of a hair dryer.

How much is a radiator repair?

If it is beyond repair, standard radiator replacement cost ranges between $292 and $1193 for both the parts and labor involved in the installation. The average cost for radiator replacement will be near $671. The cost will vary significantly depending on your model of car and the complexity of the work involved.

How long will JB Weld last?


At room temperature, J-B Weld sets in 4-6 hours to a dark grey color. A full cure is reached in 15-24 hours. J-B Weld has a tensile strength of 3960 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550ºF when fully cured.

Can Aluminium radiators be repaired?

Aluminum radiators are basically not repairable.

Will JB Weld hold under pressure?

J-B Weld™ has a tensile strength of 5020 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550ºF when fully cured.

Can you weld a leaking radiator?

No one mentioned this, but the radiator on a 1998 is made of ALUMINUM with plastic end cap tanks. Unless you are skilled at welding THIN aluminum, it's not repairable. If your options are to weld/solder or replace because its leaking so bad.

Will Stop Leak fix a plastic radiator?

Lubricates water pump and inhibits rust and corrosion. This powder formula radiator stop leak has millions of particles that permanently seal leaks in plastic, aluminum and metal radiators, heater cores and freeze plugs. For most vehicles, leaks stop in only a few minutes.

Will flex seal work on a radiator?


Can I use Flex Seal to stop a radiator leak? No. Flex Seal is not made to handle the pressure of a coolant system.

How long can I drive with a cracked radiator?

Whilst your car will usually still run with a cracked radiator, at least in the initial stages, driving with such a problem is not at all safe, and definitely not advisable. This is because a cracked radiator can directly cause your car to overheat, break down or even catch fire – scary stuff.

How do you seal holes in plastic?

Most plastics will melt and reharden when you apply heat. Use a soldering iron or a heated butter knife to carefully melt plastic around the hole. Use the soldering iron or knife or another tool, like a putty knife, to work the melted plastic into place to seal the hole. Smooth out the material as best you can.

Why does my radiator keep cracking?

The radiator has a thermostat that helps to regulate the amount of fluid used to balance the engine temperature. A faulty thermostat can cause overheating or high coolant pressure inside the radiator, leading to a crack. A leaking head gasket can cause overheating or high coolant pressure, resulting in a crack.

How much does it cost to fix a radiator leak?

Overall, you could pay $400 or more for this repair. Replacing a radiator hose is a quick and easy fix and will only run you $35 to $65 for the entire repair. A radiator replacement cost around $300 or more, depending on the size and type of your car. Don't delay when you find a coolant leak.

What is the best stop leak for a radiator?


The Best Radiator Stop Leak
  1. Bar's Leaks Liquid Aluminium Stop Leak.
  2. ATP AT-205 Re-Seal Stops Leaks.
  3. K-Seal Permanent Coolant Leak Repair.
  4. Bar's Leaks HDC Radiator Stop Leak Tablet.
  5. Interdynamics Cooling System Water Leaks UV Dye.
  6. Genuine GM ACDelco Cooling System Seal Tabs.
  7. Bar's Leaks Block Seal Intake & Radiator Stop Leak.