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Author
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Topic: Weld Through Primer, Copper Based?
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68 S-code GT
Gearhead Posts: 3835
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 03-24-2006 07:52 AM
 
I went to get some weld through primer last week and I had a hell of a time finding it. I went to a few weld supply places and they didn��t even have it. A guy who worked at one of the places actually told me that he was looking for it also and just wound up not using it. Any way, I went to the place where I have been buying paint and picked up a can of zinc-based primer. The guy behind the counter asked if I had used this kind before and recommended a different kind. It is a copper-based primer from England. He said that it had greater corrosion resistance and that the conductivity was greater. Sounded good to me but now I��m rethinking things. When you put some copper behind a hole that you are going to weld up isn��t the copper there because it won��t stick to what you are welding?
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63Kcode
Gearhead Posts: 281
From: Anna Tx
Registered: Dec 2004
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posted 03-24-2006 04:04 PM
I wouldn't worry about it not sticking. MIG wire is coated with copper to keep it from corroding. The little bit of copper just floats to the top of the weld. The copper is better for the lungs than zinc too.
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mellowyellow
Gearhead Posts: 8198
From: So. Fl.
Registered: Aug 2000
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posted 03-25-2006 10:25 AM
Had problem with Weldthru primer. For lapped pieces, coated surfaces with SEMS self-etch primer. For lap welding with pre-drilled holes for plug welding, scratched the surface, set it hot and the eggs started cooking! Worked well-still have a bit of the Weldthru and will probably toss it!
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 03-25-2006 10:35 AM
I used 3M Weldthru on my Mach and that seemed to have worked well. I liked the fact that there was no bare metal left in seams between the welds. The 3M is gray so I'm guessing it's the zinc type? ------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL
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68 S-code GT
Gearhead Posts: 3835
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 03-25-2006 04:43 PM
The stuff I have is Weld #2 by U-POL out of Wellingborough Northants, UK.
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