i was recently given two pairs of sheers both quite rusty i just took them appart and attacked with a wire brush which got rid of the surface rust and the steel underneath was fine so re-sharpened and oiled and now work fine so might be worth a try before spending money on new ones, to sharpen i used an old chisel sharppening stone which worked fine just remember that the inside of the blades has to be flat and the angle/edge on the outside