Copper sheet is what Eastwood and welding suppliers sell for this purpose. I
don't know if brass does the same.
Jim
Mark Andy wrote:
> Howdy,
>
> I was talking to a friend yesterday who's a fabricator, and mentioned that
> I was going to be starting to do some sheet metal patching work in the
> racecar to fill up some of the various holes in the firewall, etc.
>
> He mentioned that I should use a chunk of (copper or brass, I can't
> remember) as a backer on holes up to around 3/8" and then I could just
> fill them up against that, the weld metal wouldn't stick to the (copper or
> brass, I can't remember), and it'd leave one side nice and smooth.
>
> I got some copper and some brass... Which do I use?
>
> Thanks!
>
> Mark
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