I'm only able to work on my projects on the weekends and previously with my MM140 I would remove the flux core wire and discard the wire that was fed into the liner. I didn't have a shop back then, so projects were months apart.
ive heard that in some cases mig wire is stored in an oven to prevent rust but thought I'd get advice from those who make a living doing this.
ill be welding pretty much each weekend for the next month or two, so not sure i want to remove the spool each time and discard the 15ft in the mig liner, but if I need to I guess I will. I just want to make sure I prolong the liner life and don't let the wire go to waste.