Does anyone know if there is a standard way of protecting the signature made by a famous musician or other celebrity, after they sign an object, such as a guitar? Some people go to conventions and pay a large fee to meet the celebrity and get the autograph. It's often done in the hopes of selling it later. To me, it seems like the signature could be accidentally rubbed off. I just wondered if they sprayed over the signature with a clear acrylic paint or something.