Here is a thread in which someone's paint has worn away:mon monogram i was told by LV is made different than the printed items and would wear better. the LV person i spoke to on the phone said that the mon monogram are coated at a different stage than the printed items but she could be wrong thats why i asked about the mon monogram.
https://forum.purseblog.com/threads/um-i-thought-mon-monogram-didnt-have-color-ruboff.530275/
Here is a page in the club thread which features a picture of someone's bag with paint that has worn away and where people discuss the paint wearing away:
https://forum.purseblog.com/threads/personalized-mon-monogram-club.312741/page-210