I put on the paper "burnt thru" but I meant "burnt back".

I found out what I wanted to know..how close to the plug weld hole I can put the
epoxy..because that's what I'm going to use. As far as the 3M Weld-Thru is concerned
I can't see where it was affected by the welding. I guess the only benefit is that
the epoxy will seal it. When I coat my floor pans and supports I'll stay a little
under 1/4" from the side of the hole. I used all of Miller's recommended settings
that were on the side of the welder.

The distance between the edge of the floor pan and the plug weld holes are pretty 
close to the burnt back average so this tells me that I probably won't have any
epoxy on the very edge of the floor support, but since these pans are so tight to
the supports, I'm not worried about them rusting because they will be sealed with
epoxy on the outside.

When I put these pieces in the vise I tried to twist the thinner floor pans ones apart
but I gave up on that twisting cause it was too much work, so I took the hammer and
worked out on them. I can tell you that a 3/8 plug weld is going to be hard to break.