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HelicopterMain Discussion › JB Weld question
01-25-2007 11:54 PM  10 years agoPost 1
Yug

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UK. Herts

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I've just started using this stuff and was wondering how it compares to say 30 minute epoxy.
Also what actually is the "steel" resin ? does it set to a harder compound than standard epoxy ?
What are it's weakness / benefits over epoxy ?

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01-26-2007 12:04 AM  10 years agoPost 2
jimco

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east texas

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Mixed right and applied to clean surface, the stuff is really tough. I have used it to repair refer coils, due to the ice pick defrost method, used by some housewifes. Never had a be back on repairs. Good for crack repairs on motors, etc. Must be allowed to cure for 24 hours.

Honey, where's the check book, it's Fedex again

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01-26-2007 12:05 AM  10 years agoPost 3
AirWolfRC

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42½ N, 83½ W

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I suspect it's just another epoxy resin with a good helping of aluminum powder. Don't know where they got the "steel" for their description. Strong as steel ? I doubt it. Specs say it has 1/10 the tensile of steel. Also, only rated up to 500ºF.

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01-26-2007 01:03 AM  10 years agoPost 4
hammerondown

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Chattanooga,TN USA

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Yug, It's good stuff, stong. The 30 minit epoxy is likely the weakest of the quick set type epoxys. Generaly the slower the set time the stronger the molecular bond between the resin and hardner. We used to vary the cure time of the epoxy we used in the boatyard by changing the mix ratio. But you can move the ratio around so much that the cured product was actually quite flexible. I'm pretty sure that's how the manufactuers of those 5 min. and 30 min hardware store epoxies develope the results.

R50,HYPER50,GY401,TJPro,DX7

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01-26-2007 01:12 AM  10 years agoPost 5
HBKnew

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Nashville,TN

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This stuff actually works!

Not sure about "strong as steel" but at the advice of a mechanic friend of mine I used it to repair a crack in my car radiator to drive it home. I tried "stop leak" but the antifreeze poured out, JB Weld actually sealed the leak the entire trip! He said they use it in the shop to seal cracks in engine blocks, transmission repairs, ect and it works. (personally would never take my car to be repaired at his shop after he told me this)

I suppose it depends on the application needed for as to it's performance.

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01-26-2007 01:13 AM  10 years agoPost 6
slider46

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Ocala Florida

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JB Weld is great stuff is used right. I fixed a coolant leak on cylinder head on my sons car, It lasted for 3 years when the car finally just died of natural causes..... I use it to repair my rc boats and my 32' cruiser. The key is to have a clean dry area and give it time to cure properly....

Tom..... No "D" flying....

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01-26-2007 01:16 AM  10 years agoPost 7
hammerondown

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Chattanooga,TN USA

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Slider, How did you get that pre-dried epoxy from your sons car to stick on your cruiser?

Sorry Slider, in my minds eye I saw you scraping off the JB Weld after your son's car died

R50,HYPER50,GY401,TJPro,DX7

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01-26-2007 01:24 AM  10 years agoPost 8
AirWolfRC

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42½ N, 83½ W

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I agree that JB Weld is good stuff. I use it myself where appropriate.

But the claim of "strong as steel" is way off base.
Mild steel tensile is 36,000 psi and JBW is only 4,000 psi.

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01-26-2007 01:26 AM  10 years agoPost 9
VKGT

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Sanford, NC

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A friend of mine used JB Weld on his Ford 351W engine block after it cracked. Worked like a charm (not that I myself would do it )

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01-26-2007 01:30 AM  10 years agoPost 10
Yug

rrMaster

UK. Herts

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Thanks for the replies. What actually promped this thread was that I have some JR gimbal sticks which are threaded to M4. These are to go on a futable Tx which uses M3. As an experiment, yesterday I took an M4 nut and filled it with JB weld, today I drilled it and tapped it to M3 and it does seem pretty strong although after tightening up a screw with some force, the JB weld did strip away quite easily. Perhaps a few days would be a better curing time.

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01-26-2007 01:37 AM  10 years agoPost 11
hammerondown

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Chattanooga,TN USA

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Thin strip of brass shim stock slid longwise into the hole in the part should work as the thread pitch is the same only diameter is larger. Is this right?

R50,HYPER50,GY401,TJPro,DX7

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01-26-2007 01:42 AM  10 years agoPost 12
Yug

rrMaster

UK. Herts

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Yup. Considred helicoils but thought I'd try JB weld.

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01-26-2007 02:52 AM  10 years agoPost 13
slider46

rrProfessor

Ocala Florida

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Hammerondown I can se what you were reading...LOL I used new JB weld on every different application.... LOL It's good stuff in the right place. I wouldn't use it to hold my dentures in or anything like that but it is good for metal repairs if you can't weld it.....

Tom..... No "D" flying....

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01-26-2007 03:04 AM  10 years agoPost 14
Don1127

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Manhattan, NY

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I use it exclusively on metal. Works great on muffler applications. I always kjeep some in the shop.

It's easy. Just pretend it's the simulator...

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01-26-2007 03:06 AM  10 years agoPost 15
playfair

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Rochester, NY

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Nominal metric thread pitch varies by diameter; M4 is .7 pitch, M3 is .5 pitch.

Yug, if you use a tooth pick to shove some JB in the 4mm holes, then wipe a little around 3mm shafts, install to your likeness, clean up with a q-tip, it will hold!


The sky is our canvas

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01-26-2007 04:21 AM  10 years agoPost 16
hammerondown

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Chattanooga,TN USA

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Never again to be removed, but, you knew that already

R50,HYPER50,GY401,TJPro,DX7

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01-26-2007 07:05 AM  10 years agoPost 17
sla

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wasilla,ak,99654

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i used it on a crank case on a gsxr 750 and it worked perfect. i layed her down.

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01-26-2007 07:54 AM  10 years agoPost 18
Nightstalker

rrElite Veteran

UK (BEDFORDSHIRE)

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som facts on JB Weld:

Properties (psi)
Tensile Strength: 3960
Adhesion: 1800
Flex Strength: 7320
Tensile Lap Shear: 1040
Shrinkage: 0.0%
Resistant to: 500° F

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01-26-2007 12:20 PM  10 years agoPost 19
Heli1aust

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Darwin Australia

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We don't have JB Weld in Australia.
I remember way back reading in "Popular Mechanics" about the versatility of this product. On a trip to Canada and a jaunt into Montana in the US in 2005, I decided to buy some of this "magic stuff" I had heard about for so long. I used it recently to seal a pressure nipple into a muffler on one of my helis. I had read somewhere this was a good idea. Been in use for about 3 months so far and looks the same as when I applied it.

GeeTee

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01-26-2007 06:54 PM  10 years agoPost 20
bustedmp

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Shamokin, PA

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You tried it in a nut and it stripped out easy. You are only talking about a small amount. If you fill the threaded portion of you gimble knobs and then drill and tap them, It will hold much better. You have more surface area to take the load.

The world is yours!

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HelicopterMain Discussion › JB Weld question
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