What have others done to keep the frame and white decals protected, and touching up small scratches in the aluminum lugs?

What have others done to keep the frame and white decals protected, and touching up small scratches in the aluminum lugs?

As for touching up the lugs, go to a hobby store. They sell all kinds of model matt black paint.
Just a work of caution, matt black is not really the same as flat black. Matt black has a very slight gloss. I know Testors sells a semi-flat black that will probably work better than flat black.