First off Doug, you're not gonna have a lot of luck welding light gauge sheet metal (18-24 ga) with flux core, especially if you are new to welding. It's really meant for heavier material. Not that you can't do it but it taint gonna look to hot and your gonna be burning thru all the time and doing a lot of grinding.
Mig welders are much more suited to the job of sheet metal repair or Tig if you happen to have access to one of them.
I just noticed that a Mig welding kit K2526-1 is available for your Lincoln 125 machine. . What it consists of is listed at the end of this brochure. A good investment if you’re going to do any sheet metal work on your Chevy truck.
http://content.lincolnelectric.com/pdfs/products/literature/e725.pdf Denny Graham
Sandwich, IL
