I have tried the films and they get messed up and then you can't get behind the tank to fix them, I think the same would happen with the paper and it would get wet which is just another problem. As far as the acrylic, that may work but I know it can come off in sheets if it stays wet long as I generally use my glass plates as a pallete when I have worked with it in the past because it does come off of glass so easily.