Voodoo, What ever works, though that would not be my area of experience.
Coming from an aerospace background I've worked with a lot of different chemicals and I'm guessing since some of these discs fail it might have something to do with either the chemical that makes them reflective or the one that glues them together or maybe both. I wonder if these chemicals are still curing or are they reacting to each other.
I have tried cleaning, scuffing, coating with various substances and heating with a blow dryer with little success, I have not tried ultraviolet light, soaking in water, heating in an oven. You see where I'm going with this? Has anybody else tried something that didn't work? Or did?