yeah, you will... 35 is pretty snotty for sheetmetal... i just go to homo depot for spools of lincoln superarc-L56.... if you can run the 12 pd spools, DO IT!!!!!!!!! the little ones get old in a hurry.. that's obviously solid core for a gas setup..... they carry fluxcore too if your not gonna do a gas setup.... as mentioned, plug welds it's not a big deal.. little dirtier, and watch your penetration... flux blows thru easier....