Well, let me start off by saying I got a killer deal on some MIG wire a about 4 years ago. I bought a Miller 250, lease size bottle, and a near new 550lb spool of wire for $1000. Sold the welder for $1000 and kept the wire/bottle.
I have made a slight dent in the wire, but I feel it will probably last me another 10 years unless I use it ALOT more than I do. It has a dessicant bag in the bottom of it, and a plastic hood on the top the wire feeds out of, but by no means is it 'sealed'. Would the dessicant bag be enough? I haven't noticed any corrosion on it yet (I have had it for 4 years like I said above). Should I get another bag of dessicant to put in the barrel, or just leave it as-is?