I'm an amateur so my opinion is low value... I have a similar size MIG welder from Eastwood that's convertible to use flux wire. Its been my experience that the Argon/CO2 gas makes a lot of difference in the quality of the weld when working with thin gauge material. If I had it to do all over again, I would have purchase a TIG unit for the sheet metal work. You can get good results with the flux core and practice will allow you to get better.
