[DML] Re: Rust question

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

Generally when repairing rusted sections if you are not cutting the
entire piece out and splicing in a whole new piece the "best" most
acceptable method is to cut out the rusted part either in a square,
rectangular, or circular pattern, make up a piece of the same
thickness and similar type of steel and weld it into it's place. Grind
the welds smooth and paint. It is more complicated than this of course
but that is the outline. You can use a "weld-through" type primer.
Eastwood sells it and you can get it in any large welding supply.
Plating patches over rusted out sections is not a good way to repair
but I see it often because it is fast to do and takes less skill. If
you can piece a section in properly there is no need to plate over it.
When you cut out the rusted piece you should clean up the "inside" and
seal it somehow. You can use undercoating, wax, or paint. When you
weld your patch in it will burn the paint nearby but a weld-through
primer will last better. Paint the inside of your patch too. The patch
should be about 1/8 smaller than the hole so you can get a good bead
of weld penetrating full thickness. Practice on some scrap first to
develop your technique and try breaking the weld in a vise to test for
strength. You can also cut through to see if you are welding "void
free". Gas welding is easiest for beginners but MIG is preferred with
TIG being the best way to go but requires the Most skill. Keep your
repairs small to avoid warping and distortion. Pick up some books on
welding at a nearby welding supply house. You can also get a lot of
books on this kind of repair at Classic Motorbooks.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "TalksToGod" <5n-@xxxx> wrote:
> I am doing a major front end replacement and I'm putting sheet metal
> plates over the areas where I welded in order to stregnthen. My
> question is-should I zinc primer the underside of the plates in order
> to prevent small time rust/surface rust? After everythings finished I
> plan on spraying POR-15 over the whole frame so it will hopefully seal
> the plate welds and outside and no moisture will likely get in. If I
> do this will it be necessary to spray anything on the underside of the
> plates? Maybe something more then the zinc primer? To me if its sealed





To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
     dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/