nd help with finding or fixing n1k2 george decals

Hi everyone, 12 years ago I built a Hasegawa George kit. It was one of my best kits to that time. I experimented with an airbrush and loved the results. I applied the decals and it looked awesome. Unfortunately, (I'm no expert now but knew even less then) I didnt do anything to prep for the decals just put them on and they have silvered. Is there anything that can be done to save them. I have considered pulling them off and putting new ones on over a coat of future but I cant find any after market decals for this plane. It would of course be easier if these could be fixed up on the plane. Ive consider maybe putting decal set or water on them and then overspraying with future in a couple of days but dont know if that would help at all. Does anyone have any experience with this. I certainly appreciate any help that you can give me. Thanks