John Petrucci's signature disappears on back side of the Majesty 6

hi, I have a beautiful Majesty 6 blue ink with John’s signature on the back plate.
Now a few months later I notice that the signature is fading.
I assume this is because the guitar rubs against your belly.
At the moment I have a copy of the plate, cut from transparent rubber 1.5 mm thick and placed over it so that the signature is still visible.
luckily I got there in time, and the signature does not fade any further.
If anyone has a better idea, that is always welcome.
gr Marc