TowAir and Printman, the posts below might be of some help. It's basically what I did/do. Once you have the numerous filiform areas in the open panels themselves however, I would not try to repair, just get the corrosion stopped with corrosion X and then reseal with a clear coat touch up. Wax as often as you can--at least once a year.
The sanding/re-spray painting with silver/and then re-sealing with clear coat is work. It does not match exactly either--but is very close and much better than large areas of filiform (photos pretty much show what you will have with repair). If you are going to get into the skin corrosion to that extent, and want more info on exactly the method, I'll be happy to give you more details.
Printman, you are correct on panel edges. I used Nyalic to reseal the cut panels. Once is good, then corrosion X and polish each year. Keep an eye out there and the rivets from now on.
On the cast pieces: tail light housings, door hinges, boarding handle, wheel well trim pieces, they are all coated with some inferior clear coat. You can sand them clean of the old and apply new clear with little effort. If you tape off your cast pieces well, you could sand them in place (that is what you will have to do with the hinges and handle). Use a good clear coat since you don't want to revisit this again. Product of choice, I use Nyalic, a clear polymer.
See post 1917 and 1918 below:
See post 1825 below:
The CORROSION manifesto is where all your answers are TowAir. Just have to pick through to find the helpful posts.