The wall has been painted over on a number of occasions. In May 2008, the words were altered to "Angofiwch Dryweryn" (forget Tryweryn). The monument was defaced in April 2010, and a spokesperson for the Welsh Government said they were "disappointed" by the incident. Incidents of vandalism also occurred throughout the years, e.g. in 2013 and 2014. In 2017, the words "Cofiwch Aberfan 1966" ("Remember Aberfan") were added underneath the original message. This message was referring to the Aberfan Disaster which happened in 1966, were the collapse of a colliery spoil tip led to the deaths of 144 individuals.The original message was repainted in August 2018 but was again defaced in February 2019 when the motto was painted over with the name 'Elvis'; a reference to the famous American singer, Elvis Presley, known as the King of Rock and Roll. After the memorial was repainted, vandals had knocked over parts of the wall. In response to the vandalism a wave of 'Cofiwch Dryweryn' memorials were painted throughout Wales and further afield also.