QUOTE(bare 1 @ Apr 3 2010, 10:37 AM)
So what are the pros and cons of simply welding a flat plate here? Just the bottom of the hole is rusted. sides are good. Make it a shelf instead of a hole. Much easier repair instead of following all those curves but what about structural integrity??? I'm not a purist I just want a solid driver.
some photos would help.
if the hole is small, you cant determine how bad it is under the hole, patching up top may not be good idea if it is bad below. if the hole is big you cna more esialy see what is going on below.
you got to remember to remove /nuetralize any spilled acid that is in the hole, else it will keep rusting away.
send some photos so we can see what you are dealing with. look under the car for any signs of bubbled thru paint under the floor pan and on the rocker /floor seem