[1967Tempest]

I tried to fix this glass candle holder for my wife. The Cat knocked it over. I tried averything, then she said I can tie something over it. I thought JB??? It worked great! Sanded easy and can be molded like bondo!! pics arent that great, flash is on glass after all.

Dave

[Overkillphil]

General use

Qjet wells:

[stimpy]

can't fix the economy with it ....

[Cliff R]

I see LOTS of q-jets that have had JB Weld dabbed over the bottom plugs. It doesn't work well for this purpose. The fuel will "soften" the glue and lots of heating/cooling cycles will cause it to come loose.

Just yesterday I pressure tested one that looked like it was still holding fine, and it leaked right thru the JB Weld on one side. That particular repair didn't look that old, but I've learned to remove the JB weld, pull the plugs, thread the castings and use screw in plugs coated with Marine Tex instead....Cliff

[Judas]

I've used it to successfully patch the leaking radiator in my 79 Camaro in '92 or '93. It was leaking where the upper hose connection meets the tank. I was bucks down and desperate. The fix lasted a full year till the radiator started leaking again from pin holes in the tank but by then I was better off and bought a new radiator. Definitely sold me on the product.

I noticed by other replies it seems to do well on radiators- it must like brass.

Recently (last summer) I used it to glue a small hose connector back on that was cast into the side-cover of a 92 EX500 (baby Ninja). The connector had broken off very cleanly so I figured "Why not? its only a few bucks to try...". No problems. This was another "cooling system fix".

Also I tried to use it to patch a large "burst" at a muffler seam on the Camaro. That fix...not so successful.

[DiamondJim]

The only thing JB won't fix is the crack of dawn and maybe a broken heart! Great stuff! -Jim

[Shiny]

I like the stuff, but must admit it let me down bigtime when I used it on my timing cover where there was a hole between the water side and oil side. I had prepped it well, and it just lost adhesion to the casting after being heated and cooled by the antifreeze a few cycles. It didn't dissolve or anything, but stopped sticking. I wish I had thought more about the consequences of it failing before I chose to use it there.

[mviker]

It fixed a pinhole leak I had in a power steering pump. Worked like a charm.

[GTO JOHN]

JB Weld has worked great for me in all applications EXCEPT putting studs back on some 66 GTO tail light bezels.

[lowrider]

will it work on enduro bumpers. I have about a 1/4" chunk out of mine I need to fill with something

[b-man]

Originally Posted by lowrider

will it work on enduro bumpers. I have about a 1/4" chunk out of mine I need to fill with something

No, you definitely want to use a flexible filler to repair an Endura bumper.

[Greg Reid]

I've got two.
1. It can't fix a cracked exhaust manifold heat riser. Not for long anyhow. I guess the extreme heat softens it. I tried it on my '69 LeSabre two or three times. It would repair the leak every time but would only last about 20 minutes into the first run.
Possibly I didn't get it quite clean enough by wire brushing but I just don't think it can stand the heat inside the manifold..

2. I once made a muffler out of thin aluminum for a 2 cycle model airplane engine. I glued it all together with JB Weld. That lasted about five minutes before it blew apart. High frequency vibration was probably the culprit there though...plus, very little mating surface for the parts that were assembled.
I did modify a factory muffler later for another similar engine and in that case it worked fine. Didn't crack until I crashed the plane sometime down the road...

[1971GTO]

I used it to re-furbish the rusted metal at the lower corners of the dash-windshield before I installed the glass. Good stuff.

[RA6T7GTO]

i used jb weld on my 78 suzuki engine case when i put a hole in it while installing the gear shifter on, i had it a few years and never leaked

[301Store]

Originally Posted by Tone

So the question is...is there anything it can't do?

Yes, it can't fix a radiator that you would ever want to have rebuilt one day.

I did this once, then a couple years later I went to have the rad recored.

The tank I used the JB on had to be replaced instead of repaired. Apparently once JB weld is on there, the rad shop can't get it off well enough to have clean metal to solder for the repair.

Fuel tanks, be careful. The patch softened up on me after a couple years and started dripping. Worked well enough for a while though.

Shawn

[Stuckinda60s]

Originally Posted by Shiny

I like the stuff, but must admit it let me down bigtime when I used it on my timing cover where there was a hole between the water side and oil side. I had prepped it well, and it just lost adhesion to the casting after being heated and cooled by the antifreeze a few cycles. It didn't dissolve or anything, but stopped sticking. I wish I had thought more about the consequences of it failing before I chose to use it there.

I didn't use JB, but used Plastic Steel for a similar repair. I cleaned it really well and ran a brass screw through the pinhole through the casing. I still have the cover and it's still tight after 40-50 thousand street miles. The repair didn't separate from the casing, at all.

[Shiny]

I wish I would have asked for help first !! My luck has been running that way lately. I'm glad to hear yours worked. I suspect putting a screw through it was a very smart call, and perhaps the adhesive you used is more resistant.

The pics attached show my failed repair. When I did the repair, the JB Weld was hard and well-bonded, as I was able to grind it flush with the casting surface with no hint of bad adhesion. You can see I did a decent job prepping the holes with a dremel burr, and the JB Weld did not disintegrate, but simply popped out of the casting. A screw through those holes probably would have trapped the epoxy and kept it from leaking (like yours), but I think the loss of adhesion is an unavoidable chemical reaction when exposed to hot antifreeze. It would be interesting to know if there are other adhesives that would hold up better in the same situation.

The white glop dribbling out of the failed repair site is what my oil looked like after being mixed with a couple gallons of coolant. The nuggets are the JB weld plugs that popped out and were laying inside the cavity when I pulled the water pump off.

[Stuckinda60s]

Yours was much further deteriorated than mine was. For yours I would have prepped both sides, roughing the surface to get adhesion, smeared the JB-Weld on both sides, making sure it was pressed in from both sides. Then using a piece of roughed, light sheet aluminum on both sides as a strongback, pressed as closely to the cover surface as possible, with a minimum amount of epoxy between the cover and the metal. The excess epoxy can be used to cover the metal.

What you end up with is a sandwich with the cover and epoxy in the center, a thin coat of epoxy on both sides (as bonding agent), the sheet metal on both sides and then another layer of epoxy. You end up with the epoxy as one piece from the hole, under the metal and then around it over the sheet. The sheet may erode to some extent if it's exposed, but will still give strength to maintain the patch.

Doing it like that gives the epoxy some support so that it doesn't have the pressure pushing against a broad area trying to separate it from the cover.

The problem is caused by allowing the anti-freeze to get acid. When it does there's electrolysis between the aluminum and the cast-iron of the block, wasting the aluminum.

If you take a voltmeter, stick one probe into the anti-freeze and the other on the block, you can read a voltage. You should read less than 0.4 volts if the fluid is good.

[Bjorn]

well, I know one broken thing it cant fix....

a broken heart!

[guccieng]

Is there anything JB weld can't do? Seriously.

it can even revive a 2 year old thread! (sorry, guys. i couldn't resist)