A spray fixative should do it. You can get it at an art supply store. I had a similar thing on glass and it worked great… but for display, not something going in and out of your pocket. Is that the actual phone or a case? Either way if the autograph is important to you its now a display piece.
A spray fixative should do it. You can get it at an art supply store. I had a similar thing on glass and it worked great… but for display, not something going in and out of your pocket. Is that the actual phone or a case? Either way if the autograph is important to you its now a display piece.