I've had this welder for 3 years, and I'd say it's had a good life. I wax it when it gets dirty, and comfort it when it's sad. The other day it had it's first real problem. I went out to the shop to finish welding up my roll cage, and the very first arc and it wouldn't feed. So I open up the case to find that my wire has oxidized (copper coated ER70). After trying to blow the liner out with compressed air and everything else I could think of, I decided to go to my favorite welding supplier and talk to him. He recommends a new liner and leaving the door open on my welder so it can ventilate. He also says that he would try the wire that is in the welder before scrapping it. I purchased the liner along with some clip on wipes. Well today I get a few hours to go work on the cage again and I start welding and I am hearing the feed wheels slipping and my welds are looking horrible. I tried adjusting the tension and cleaning the feed wheels again but no dice. Should I scrap this almost new roll of wire and start over? Does anyone know of a spray that can be applied to the wire to help prevent the oxidation on the copper coating? I appreciate anyones advice.