Modern adhesives

[Snowtractor]

I watched an episode of TRUCKS! on Spike TV , sat mornings. In it they used an adhesive to bond replacement corners on a truck that had been rusted out. It was impressive stuff, they used a caulking gun to apply it and used strips of 1" flat steel with clamps to hold it for a period of time and then prepped and painted like normal. I can't remember the specs on it , but essentially it was permanent as welding with some benefits. These included no warpage of the metal from heat, less chance of water penetrating between the joining surfaces, and less protective equipment needed.
I would definitely use the product when and if I need to join panels.
ONe word of caution, proper prep is the key to success. I do believe there was something like 1 hour wokring time, but I may be wrong on that one.
Look on Spike tv's POWER BLOCK website to find trucks and links to some of the products used on the show. It was for a Chevy S-15 buildup for 10,000 dollar budget truck.
Sean