OT - Welding Wire Size

[rbruno68]

I am novice at welding and feedback on others experiences would be a big help. I am starting the body work and rust repair on my truck. I am trying to get better at welding sheet metal. I have a Lincoln Mig 210 welder. So far, I have been using .025 weld wire. What wire size do most of you use and how does it impact the welding process? I am still playing with the weld settings. I think my welder runs a little hot for the metal because I blow through sometimes even on the new metal. I have it set on either 20 or 22 gauge which I think is a little thin compare to what the metal actually measures. I do have .035 wire but haven't tried it yet. Any advice on wire size or adjustments to the welder for better sheet metal welding would be greatly appreciated.
Rob