I've recently bought a car and just found that there's an awful lot of rust beneath it and it will require a lot of welding. I've got a cheap Arc welder which I'm happy using for most things but MIG welders are much better suited for the thin sheet metal on a car. A few years ago I bought a Cosmo 130 Mig welder 2nd hand of eBay which I had a lot of problems with, the wire feed would always block or slip and have to be re-fed through, I couldn't get it to work consistently and never used it for anything. So looking I'm for a Mig to weld bodywork and exhausts, should I get a decent second hand one or a less decent one new? I've had a google search for good MIG welders but all the sites say different things and are possibly sponsored. Could you recommend some welders to look out for, new or second hand and the reasons why? I could spend up to £600 but if the difference between that price and the really cheap ones isn't very much then I'd rather go for the cheap one so I have more to spend on the car itself or put aside for a TIG welder and set-up in the future.