lol you don't have to have gas to weld thin on mig just makes it somewhat easyer
and gassless flux can be used on thin just turn down the amps and turn up the wire speed and have a grinder near by for when your done dosn't make pretty welds but it will weld it fine
He is right, I have gone through 1 spool of wire so far on my flux core. It isn't pretty, but I am grinding all the welds down anyway. If you want to weld where it shows & are not going to grind it down, go with the gas. Flux core is a little messy.
