First, Sorry to hear about your Dad.
RE: The white board. I would be very hesitatant to spray anything on it.
You could get a small inexpensive white board and test some spray products on it, but even then, you never know if you are using the same kind of pen as the original and that might make a difference. Who knows.
I would either get it Framed, or just bolt a sheet of Plexi-glass or Lexan right onto the board itself to cover and protect the original image.
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