Any of you used raw cork bark for scenery? I had a friend who knew I was into model trains showed up the other day with a box of raw cork bark. He said it looked to him like it would make good scenery on a train layout. I have to agree! It looks very much like rock formations. This is not processed in any way... which make me wonder if I need to treat it somehow before using it? Anyone tried this before? Did you preserve the cork before hand?