Previous person got a roll of 4043 .035 to fit on our wire feeder. Couldn't get it to work cause of the dreaded bird nesting thing. Went back to spool gun. Should have been tigging the part but alas no tig in the shop. So with a 15 foot tesgaskis gun, Teflon liner, .035 tips, and u groove rollers it turned out sweet. Bird nests to a minimum and those usually at start. Al is not steel and you can't weld with it as if it was.