QUOTE(Wilhelm @ Mar 18 2009, 01:34 AM)
If you tig or mig welded right through the center of each screw hole you could essentially spot weld each hole and seal the firewall. This could potentially be a clean fix for this. Alternatively you could force JB-Weld through the screw holes
to bond the part and seal the holes, however, epoxy used in that applications has low shear strength.
No JB-Weld or epoxy for me since I have my own MIG welder.
As part of my ongoing "rustoration" that is currently progress,
I'll be welding it properly. Its a very simple/easy job.
Screws will be removed and holes will be MIG welded shut.
Once done, it should be undetectable that there were ever holes
there.
I only showed the photo for an example of what "could" be done,
not that I recommend it all.
BTW, the firewall is double walled where these screws are.
It is doubled walled all along the bottom edge of the window opening
so the screws do not go through to the interior of the cabin.
They terminate into the air space between the two walls.
--- bill