I have found a simple, common sense method to fix faded sparkle finishes; colored Sharpie markers and ink pads.
My MIJ Apollo set had some faded areas on the rack tom and bass drum. I had a red Sharpie at home and colored in a small area of the red sparkle faded area. It looked great. You could barely tell there was any fading, and it dried almost immediately.
Today, I bought a Sharpie Magnum marker at Staples and went to work on the drums. Outside of getting a lot of red ink on my fingers (the wife had nail polish remover that got most of it off), the drums look dandy. Not perfect, but much better. I'm going to let them dry thoroughly over night and then wipe them down with a clean rag tomorrow night.
Has anyone ever tried this method of restoring faded sparkle finishes? I can see that gold, silver, green and blue sparkle would come back to life easily with an appropriately colored Sharpie.