When I was young I learned to repair cassette tapes. The repair job sometimes included with Scotch tape, Crazy glue, a whole new tape carriage, and possibly the replacement of screws I would get from another tape of less important than the tape I was working on. At first I thought it was practically impossible to repair a tape that had popped but sure enough picking up little things here and there I realized any tape could be fixed no matter what the situation was. I have also heard of cats that repaired 8 track tapes back in the day! I am not surprised because the music was so smoking, you would find a way to keep the music flowing. To be honest with you if the tape was burned or melted it made no difference, as long as the actual tape thread was not destroyed we could make it work.