I was just at Home Depot and looking at the Lincoln mig wire. I was there for steel wool, but this thread had me thinking. 2 rolls had spots on them like they were rusting. I had heard that before and actually had seen brown spots on flux core wire at HF. Maybe quality can be sort of a crap shoot at times. I'm gonna have to find another local welding supply seeing how I don't work buy the one I was using anymore.
I've had good luck with the 3" Rol-Loc scotch bright pads at HF.
