Shipwright,
As usual my hands started typing way before my brain had read your question. The add on gas kits are quite effective..my son has done this and loves it. I think something needs clarification though. A wire feed welder IS a mig welder, that is the process name. It doesn't matter if if runs solid wire with shielding gas, flux core wire with/without gas, it is still MIG.
Remember, the larger the wire, the more amperage (heat) it takes to transfer it.
Thin body panels don't like HEAT. I have a 225 amp Hobart machine and when I do light body panels I put on a small reel of .024 wire called EZ Grind. I was told all the body shops use it.
Cujo8, I will try to clear up what I meant. I thought Shipwright had a stick welder. You can make a TIG welder (not mig) from this power source quite easily. Your solid wire/gas setup is no doubt great, it is also DIFFERENT than the flux core process. Home Depot, TSC etc sell these units with fluxcore wire because they are cheaper than units with gas...then they get to sell the gas retrofit units later..a double whammy. I hope everyone is clear on this because I am so fricken confused I need to change my depends.
Stuart.