My 1979 Camaro Z28 Project!

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Blu-By-U 79Z

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Feb 11, 2009
5,742
Kentucky
Spent some time tonight trying to help straighten the fender vents out. I believe they were over tightened at some point… (probably by me) so where the studs are they had small dips. I got the majority out and they look a lot better.

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I found that one of them has a small hair line crack that got alittle worse after I fixed the majority of a bend in it. I’ve read somewhere people using JB weld to repair cracks in pot metal. Anyone have any input?

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Blu-By-U 79Z

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Feb 11, 2009
5,742
Kentucky
All right, so I did some more digging online on how to fix pot metal and there’s several different ways people say they do it. I decided after doing research that I was going to use some JB weld because on some Mustang forums they talked about using JB weld to fix cracks and the quarter panel extensions which are also pot metal and they’ve had pretty good luck with it.

So what I did first is took a 1/16 drillbit and drilled the ends of the cracks. Then I took a carbide bit and made a V out of the crack.

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I took 80 grit sand paper and sanded the area around the repair. Then came back in with some 40 grit and did a few more scratches just to make sure it would have plenty of tooth.

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After I grease and wax removed the area I was ready to go. So I mixed up the JB Weld and worked the front side first filling in the V groove and holes.

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Then I flipped it over and smeared where it came through the holes, then I put a layer over the repair area. I used a piece of aluminum window screen and cut it to shape. (The mesh should help strengthen the repair, granted it’s more cosmetic than anything.) Then I pressed it into the JB Weld and wiped another layer over it. I didn’t go really thick but just enough to cover the screen. I used a screw driver to press the screen in good and here we are.

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I’m going to let it set up good and will update you guys later. -Matt
 

Blu-By-U 79Z

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Lifetime Gold Member
Feb 11, 2009
5,742
Kentucky
Got home today and blocked the front side of the repair. Seemed to sand decently. Once I smoothed it out I could see what I was working with. Just had one small low spot so I was pretty happy with that.

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The area were the studs are have slight dips from being tightened over the years so I sanded the epoxy with 180 and then came back and did a quick hit of 80 grit over the dips and the repair area. I wiped the area with filler (looked terrible, it’s been a while and it was kicking over super fast with the upper 80s temps today) I normally let filler set over night before blocking it but I wanted to get an idea where I’m at. So I let it set for about 45 minutes or so. Then sanded with 180 grit. There are still a few small spots but it’s looking pretty good. I think one last thing skim and I should be able to epoxy and put a couple coats of primer. I need to do the other vent as well.

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hubedobeedo

3rd times a charm
Jul 18, 2013
1,713
Huntertown,IN
Spent some time tonight trying to help straighten the fender vents out. I believe they were over tightened at some point… (probably by me) so where the studs are they had small dips. I got the majority out and they look a lot better.

View attachment 215129

I found that one of them has a small hair line crack that got alittle worse after I fixed the majority of a bend in it. I’ve read somewhere people using JB weld to repair cracks in pot metal. Anyone have any input?

View attachment 215131
for a painted part reinforce back side and fill the outside crack with paintable epoxy.
 

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