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post #1 of 17 (permalink) Old 08-17-2017, 09:13 AM Thread Starter
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Default Aluminum epoxy

Anyone ever attempted to repair broken aluminum? What were YOUR results?

I'm attempting to repair an aluminum carb body. The broken part is one of the posts that the float pivot pin goes thru. This particular one is off a generator. So far, I've (twice) attempted this repair and met with dismal failure. Product I've used is JB Weld steel, which is "supposed" to be good for aluminum as well. I've never attempted this type of repair myself, but have read numerous accounts of other people having great success at it.

I've mixed, in equal portions, according to the directions. Cleaned with acetone, again, according to JB Weld's web site and no joy in both cases. Epoxy stays tacky, and repair fails.

One possible problem.. is epoxy too old? Maybe. Not sure when I purchased it, but it doesn't appear to show any signs of degradation. Resin is black, hardener is cream. and when mixed they turn grey, which is what is supposed to happen.

Any thoughts? Any suggestions on different products? Replacement carb is around $130 so it's advantageous to repair if possible. Doubly so as it belongs to forum member Barb (OutoftheWoodwork) and I don't want to annoy her.

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post #2 of 17 (permalink) Old 08-17-2017, 09:24 AM
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Any chance of a photo Brian. If it's two very small surfaces then I doubt if there is any fix unless there is room to reinforce the post, if this can be done then then KNEADIT is the only product that has given me great results, when hardened, which does't take long it can be filed, drilled and even tapped.

Selleys Knead It Steel - Epoxy Putty | Selleys Australia
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post #3 of 17 (permalink) Old 08-17-2017, 10:47 AM
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The John Deere dealer I used to deal with when I had my skidder used a product called Belzona. It would bond just about anything so I bought some. I never used it all up before it got fairly old and it didn't want to set up either. Same with another I bought. It takes several days now to get really hard. I would guess that the hardener must degrade.
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post #4 of 17 (permalink) Old 08-17-2017, 10:47 AM Thread Starter
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Originally Posted by harrysin View Post
Any chance of a photo Brian. If it's two very small surfaces then I doubt if there is any fix unless there is room to reinforce the post, if this can be done then then KNEADIT is the only product that has given me great results, when hardened, which does't take long it can be filed, drilled and even tapped.

Selleys Knead It Steel - Epoxy Putty | Selleys Australia
Will try and get pics up soon. And, yes, it is a couple of small surfaces. The main thing that has me confused, and makes me suspect the epoxy, is that the epoxy does not cure. It's been almost 48 hours this time, and the epoxy is still tacky.... and this time I even went a little extra on the hardener.

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post #5 of 17 (permalink) Old 08-17-2017, 10:50 AM Thread Starter
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Originally Posted by Cherryville Chuck View Post
The John Deere dealer I used to deal with when I had my skidder used a product called Belzona. It would bond just about anything so I bought some. I never used it all up before it got fairly old and it didn't want to set up either. Same with another I bought. It takes several days now to get really hard. I would guess that the hardener must degrade.
Thanks Chuck. That's the direction I'm heading in. I purchased some fresh stuff today and will try it. I've read enough accounts of others success, so I think that's the only variable.
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post #6 of 17 (permalink) Old 08-17-2017, 11:54 AM
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Brian; there's a low temp. Aluminum brazing stick available. You use an ordinary propane torch.
I got mine from KMS Tools but I've seen it online as well. Hobart and Bernzomatic make them.

Quick and Easy Brazing Aluminum, Copper and Nonferrous Metals: 9 Steps (with Pictures)
https://www.amazon.com/Bernzomatic-A.../dp/B0000CBJGI
Bernzomatic AL3 Aluminum Brazing and Welding Rods-334491 - The Home Depot
https://www.amazon.ca/Hobart-770206-...MJM98AA1GX4BMK
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post #7 of 17 (permalink) Old 08-17-2017, 11:57 AM
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Belzona works well, can be speendy. Devcon is also a good choice.

Biggest challenge is getting pieces clean for any epoxy. If there is any oily residue your bond will be weak. Roughing up surfaces helps, a good alcohol clean or strong degreaser can help.

A friend with a tig welder and a lot of skill is your preferred repair.
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post #8 of 17 (permalink) Old 08-17-2017, 11:58 AM
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Thanks for bringing that up, Brian; I learned a lot from watching his technique in that vid (I hadn't seen that one before). Slick!
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post #9 of 17 (permalink) Old 08-17-2017, 05:32 PM
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Another vote for Belzona. Great stuff, works as advertised.

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post #10 of 17 (permalink) Old 08-17-2017, 11:25 PM Thread Starter
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Thanks for the videos and the tip on the Belzona. I've not seen that in my normal stores, might have to search a bit further for it.

And, as of 30min ago, it's STILL tacky to the touch so it has to be a defective or old product that I used.

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