Air Punch Flange Tool

Does any one have any comments about using an Air Punch Flange Tool and then spot welding the quarter panels? I have heard that it could possibly rust from the back end. Both sides of my Duster need lower quarter panel work, in front and in back of the rear wheels. I would love to just buy two new full panels for $1000 but that's not in the budget. I though about trying to form them myself.