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Best tip I can give you is to get a self darkening shield, the Gnome won't use the old green glass type after trying one.
Best tip I can give you Captian Zok, is
not to weld on a petrol tank!!!!
Bare skin + welding radiation = bloody sore skin.
Always wear eye protection when someone is welding, as the radiation from the arc wil burn your cornea (known as Arc Eye) and feels like sand in your eyes. Simple saftey glasses will stop it OK.
Best welder to get is one that's bigger than you need - 200A will last longer on car welding than a 150 or less, cos it won't be gettign thrashed (bit like driving a 1.0 litre Corsa from Brighton to Edinburgh every day - a big Omega is a far better tool for the job).