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Old 08-25-2011, 03:46 AM
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Sheetmetal Repair

Hi Guys,
I am new to the forum but have been an avid observer and user without posting or being a member but have to ask several questions on sheet metal repair such as rust repair, new metal and other methods for restoration. When someone does this sort of repair a MiG welder is used to graft the new metal in place. These welds are then flattened down on the visible side to level them to match the contour of the surrounding body. So far this seems like the standard procedure to repair a car but the underside of this grafted piece of steel cannot be finished nor painted and the welding is a site of potential rust due to condensation. There may also be folds or lips created that also cannot be sealed painted or protected or the heat from the weld would burn away any prior treatments. With new cars this is not an issue because the car is dipped into anti corrosive sealer primer etc and thus provides protection in the ares I have mentioned .
My question is how does a restorer finish the reverse side of the unprotected area out of sight side of the repair ?? If there is a folded lip this creates a potential for rust because this also cant be finished as the factory corrosion dip method is used. How does one seal and prevent rust happening on the other side of that immaculate cosmetic finish? Am I missing something? How can you seal the weld and exposed metal on the opposite side of the shine? How is corrosion prevented in those areas and the hidden bare metal side of a patch job? Welding panels to areas on a car are rust waiting to happen from underneath that perfect finish. How does a repairer prevent rust happening in these repairs?

Steven
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Old 08-25-2011, 05:43 AM
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When we make a seam we will put it where its easiest to get at from the back side ,it'll need to be hammerd and dollied after its welded and ground flat so you'll need to get your arm in there..Theres very few spots you cant get at once you pull the interior out but you can easily cut out any inner pieces to gain acess then weld it back in.
spraying a weld thru primer before you weld helps a lot...
when your finished the inside can be sealed with epoxy ,seam sealer and/or undercoating...an undercoating wand can be a big help too...
But your right, leaving the inside undone wouldnt be a long lasting repair...
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Old 08-25-2011, 06:42 PM
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Sheetmetal work

Thanks for the reply. I am contemplating fixing my car that has some minor rust and have been planning the method of how to do it. Theres no problems with the visible side area of it but rather the reverse side of the repair. Its located near the rear wheel arch lower section and there is no way to access or treat the reverse side of it. If you think about it rust usually appears in areas such as this where there is generally no access to once its "cut and shut". Most cars have such areas whereby you cannot access the reverse side.
I just dont know how to do it other than fibreglass. I would like to maintain steel which can be done easily enough but not the integrity of the un protected side.

Steven
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Old 08-26-2011, 04:57 AM
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If theres no way to get at it you would put a hole in it so you can get a wand in there then put a rubber plug in the hole ...
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Old 08-26-2011, 05:41 AM
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A spot that low on the car might be candidate for bonding the patch on. Its not likely that it would show down there, and you could paint everything (except the bond area) before clamping, and make it as rust proof as new. Screws are used to hold it until it cures, then remove the screws and add more adhesive to the screw holes.
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