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Old 06-16-2012, 06:32 PM
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A question about Cold Galvanize Compound.

I have been using this product on my seams before welding for quite some time.

I was wondering though, When I read the can it says that it lays down this sacrificial zinc coating. Does this sacrificed zinc eventually corrode and give way to steel corrosion?

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Old 06-17-2012, 10:16 AM
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I never thought about it that way, as that is exactly what the galvanizing on a chain link fence is doing, it's a "sacrificial coating". But that IS exactly what "weld thru primer" is, a zinc (I believe it has to be super high like 90% zinc) coating that you can weld thru. I am not sure, but that cold galvanizing compound is exactly what the industry has been saying for a number of years and it is part of the repair procedures laid out by ICAR (a group that has created guidelines for the autobody industry) and manufactures like GM and many many more.

Some have come to change the recommendations some limiting the use a little. They basically say the seams should be epoxy primed or left in "E-Coat" (a factory coating new parts come in from the manufacturers like Ford, Toyota, etc.) and ONLY strip it right at the weld and apply weld thru primer.

They added this because people had the wrong impression and were stripping the entire pinch weld area and spraying weld thru. I still see guys doing this in the shop.

But honestly, it is a standard of the industry and I don't believe you have anything to worry about. But in the future I would recommend to use it like the manufacturers have updated to, only at the weld.

Brian
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Old 06-17-2012, 01:01 PM
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Yea, I guess time will tell to see how well it really works. I use that Eastwood Anti-Rust goop after I finish welding so I think it should be okay regardless. In fact I shoot that goop on the underside of all my panels.
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