Bodymans tape?

I was talking to a guy about sand blasting the body of my duster told him I have to get a quarter panel replaced, he described how he does patching. He uses body man's tape, he cuts the patch a little larger then what he cut out and secures it with a two sided tape then welds them together as a lap joint. I'm not a body guy but this is new to me, may take a lot of filler to smooth out. Has any body done this?
Im nota body guy but that sounds terrible. Why not butt weld it. If you can get to the inside of something like a quarter just do a "cut and butt a s made famous on you tube by "fitzee" .
I have also flanged panels to overlap and weld in patches. But the cut and butt works better for me in most cases.
How are you going to sandblast that sheetmetal without it warping all to hell and removing factory filler? I think most people use a much safer media these days.