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Old 12-13-2012, 02:13 PM
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Radiator Leak Sealer Recommendation

I'm not sure if this is the correct forum for radiator post but here it is. I have a radiator with a leak in a spot I can't solder so I am soliciting suggestions for a really good metal repair epoxy product. Do you know of any?

Thanks
Willy

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Old 12-13-2012, 02:26 PM
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I hear the Bars stop leak works, but I would only use it as a temporary measure and plan on future replacement.

"Mechanic in a bottle" aren't permanent fixes.
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Old 12-13-2012, 03:23 PM
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I got nothing against stop leak products. I have ran them for years without the leak recurring.

The latest was an intake manifold gasket leak to the intake port. I used Block Seal and the steaming stopped after running about ten minutes. It also stopped a rad hose drip. I was going to tighten up the hose clamp but I will leave it to see what happens.
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Old 12-13-2012, 04:59 PM
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If you use epoxy the slower drying products are stronger because they don't produce as much heat when curing ! A business acquaintance of mine has a radiator shop and repairs the aluminum cores and plastic with a "slow cure" Industrial epoxy it may work on what you cant solder!

I like the powdered copper and silver stop leak in the small plastic clear tubes and it doesn't plug the heater core and lubricates the pump! I used to use solder seal in that form but cant get it here and use a product just like it but forgot the name!

Jester
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Old 12-13-2012, 05:06 PM
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Originally Posted by painted jester View Post
If you use epoxy the slower drying products are stronger because they don't produce as much heat when curing ! A business acquaintance of mine has a radiator shop and repairs the aluminum cores and plastic with a "slow cure" Industrial epoxy it may work on what you cant solder!

I like the powdered copper and silver stop leak in the small plastic clear tubes and it doesn't plug the heater core and lubricates the pump! I used to use solder seal in that form but cant get it here and use a product just like it but forgot the name!

Jester
The Block Seal has the particles of copper in it. I guess its similar but in liquid form?
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Old 12-13-2012, 05:18 PM
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Alumaseal is the best stuff going to long term repair. It will hold for years bars leak stops working after a long while.

http://www.goldeagle.com/mobile/prod...oduct9D29.aspx

Easily the best stuff on the market for radiator leaks.
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Old 12-13-2012, 05:24 PM
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That stuff worked for me when a mechanic jacked by fox body up by the radiator support. Put a hole the size of a my thumb in the radiator. He agreed to fix it but they did not have new one in stock so he ordered it and stuck some of this stuff in my radiator and it sealed up after a few minutes of driving. I had to put water in it once but it was sealed when i got home and lasted for a good while. I decided to make a few other upgrades while i was at the shop. So i waited a few extra weeks. No issues at all.
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Old 12-13-2012, 05:48 PM
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Alumaseal is the best stuff going to long term repair. It will hold for years bars leak stops working after a long while.

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Easily the best stuff on the market for radiator leaks.

Alumaseal is what I use now its almost identical



I just found out the new Aluma seal is the old Solder seal no wonder I cant find it here LOL

Jester
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Old 12-14-2012, 10:15 AM
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These look like great products however, I am looking for an epoxy type product. You know, mix and spread on outside of radiator. I'm trying to avoid the internal products.
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Old 12-14-2012, 10:32 AM
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.... Put a hole the size of a my thumb in the radiator. He agreed to fix it but they did not have new one in stock so he ordered it and stuck some of this stuff in my radiator and it sealed up after a few minutes of driving.
Sealed a hole the size of your thumb?? Really?
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Old 12-14-2012, 01:51 PM
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Originally Posted by Big_Willy View Post
These look like great products however, I am looking for an epoxy type product. You know, mix and spread on outside of radiator. I'm trying to avoid the internal products.
I'm sure 3M has something that will work.

Product Catalog Detail - Industrial Adhesives, Structural, Non-Structural, Bonding Tapes, Fasteners, Custom / Die Cuts - 3M US:*3M
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Old 12-14-2012, 02:11 PM
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Originally Posted by Big_Willy View Post
These look like great products however, I am looking for an epoxy type product. You know, mix and spread on outside of radiator. I'm trying to avoid the internal products.
Jb weld is the best soft epoxy that you can get in the store. The hard putties you see in the tubes at most parts stores is really good as well but internal product is the way to go. Alumseal is a safe product its not going to mess anything up, the jb weld or any putty epoxy is going to be hard pressed to seal a leak unless its totally dry. Even then its probably going to leak again.
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Old 12-14-2012, 02:16 PM
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Sealed a hole the size of your thumb?? Really?
Yep it was crazy funny. The mechanic had a mustang engine and trans i wanted to buy from him. So if it blew i was going to get a good deal but she drove home and sealled. It was blowing water out like crazy but as long as i kept putting more water back in it was fine and totally sealed after about 20 miles.

I had to make my way home and to work the next day so didnt have a choice. Mech said he would fix it if it blew so i wasnt worried and his junoir tech never worked on my car again. Lol
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Old 12-14-2012, 03:07 PM
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That stuff worked for me when a mechanic jacked by fox body up by the radiator support. Put a hole the size of a my thumb in the radiator. He agreed to fix it but they did not have new one in stock so he ordered it and stuck some of this stuff in my radiator and it sealed up after a few minutes of driving. I had to put water in it once but it was sealed when i got home and lasted for a good while. I decided to make a few other upgrades while i was at the shop. So i waited a few extra weeks. No issues at all.
Was it a crack as long as your thumb or a hole as big around as it? I can't see it plugging a big hole, but I could see it fixing a long crack.

Jester
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Old 12-14-2012, 05:57 PM
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Was it a crack as long as your thumb or a hole as big around as it? I can't see it plugging a big hole, but I could see it fixing a long crack.

Jester
A holeish crack i would call it. If you ever owned a fox body you know what i mean by jacking the car up by the cor support. Its the first thing under the car to look like its thick metal. But it was almost as big around as my thumb.

I. Also drained the rad a few days later and all the metal flakes came out and new fluid in so it doesnt seal up until it hits air or something.
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