I'm going to pull the tub off the 40 this spring and cut out rust. I have a stick welder avaliable to me but I need to buy a small MIG for the sheetmetal work. Any suggestions? Is it possiable to get a nice weld without gas? I haven't used a MIG in years and was hopeing the flux wire had inproved. I know it use to make real nasty weld when we used it for repair work on gates.