Roger -
MIG welding is the way to go.
What you want to do is clean the area around the hole (both on top and
underneath) with a wire wheel on a high speed grinder or a drill, until 
the
area is perfectly clean. Then vice grip a piece of thin gauge copper to 
the
underside of the hole as a backing. Set your 110v welder to a relatively
high heat setting and puddle the weld into the hole, filling it.
Once things cool off, unclamp the sheet copper, which should fall off, as
the weld won't stick to the copper. Now grind the weld flush with the 
fender
on the top. You're done, and it only took about ten minutes total.
Ron
> I just picked up a nice rust-free set of fenders for my '58 DeSoto
Firedome
> in California after a five year search for a good reasonable pair.
Problem
> is they're from a '57; same sheet metal but side trim in a different 
> place
> and those hellacious double chrome spears on top.
>
> What's the best way to fill in the holes?  I've heard they can be 
> welded a
> little at a time from the outside in, and that's preferable to bondo. 
> Any
> other suggestions?
>
> --Roger van Hoy, Washougal, WA, '55 DeSoto, '58 DeSoto, '56 Plymouth, 
> '66
> Plymouth, '41 Dodge
>
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