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Old 11-05-2008, 07:34 AM
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Question about panel repair

I have been a lurker for a short time and there was a question in my head that has been itching me for sometime, and what better place to ask than the experienced Hotrodders...

My question is, that a car from a factory has corrosion resistant coatings applied, dipped, galvanized into basically all the metal frame, unibody and panels. When you go through a repair due to collision, the welder mostly make externals welds, which are then ground down level to the surface around the initial weld. During this process, the weld should penetrate to the "other side" of the two metal pieces and subsequently heats up the surround metal to very high temperatures. So, I would assume the internal surface of the welded area that is not readily accessible to the bodyman would not have the corrosion resistance before the repair. Since the external surface will be primered, sealed and painted, that shouldn't be a problem, but what about the internal repair surface?

Doesn't that become a problem in longevity especially in Northeast region where winter weather might eventually break down the repair "internally."

Just something I was always curious about...

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Old 11-05-2008, 08:32 AM
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The general feeling is that you would spray weld thru pimer in the joint before you weld-it is the best solution short of using a bonding adhesive. If you weld it on, then you would spray an Epoxy or some sort of sealer/coating on the inside of the repair-
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Old 11-05-2008, 04:19 PM
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I am glad there is some sort of method for resisting corrosion in repairs. I just hope if my car ever needed repairs, the welder/bodyman would take the time to treat the surfaces with the weld-thru primer before joining two pieces together.

Thanks for the explanation
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Old 11-05-2008, 09:45 PM
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Using a weld through coating is just a small part of what needs to be done to restore the corrosion protection. Epoxy primers, paint, cavity wax type self healing coatings, seam sealers, all play a big part. Welded areas that haven't had their interior areas/panel backsides treated for corrosion resistance will soon start to corrode.
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