I hear you. I have an argon tank but, it ran out today as I was welding. Being Saturday, the welding supply house is closed. I should have stopped working until I got my argon refilled but, I was impatient. The other fenderwell should come out MUCH better.
do yourself a favor, get a gas shielding tank for that MIG, you'll thank yourself. It will make 1000x better welds than flux core popping all over the place. Less cleaning and stronger welds.