I'm sure you can buy special paint for fridges,a large D.I.Y. store can advise you,you can buy paint for radiators and the like.Look at the Hammerite Smooth paint for metal range and follow instructions.It is a common job you are doing so dont be put off,you can also buy big stickers(like fridge wallpaper)to freshen it up with dolphin/aqua type scenes on them(I think Kleeneeze home catalogues do them).Good luck be bold.
Rich
July 2006