I'm building one of the rubbermaid tub setups from Greg Maxwell's site for a small GTP. In his directions he advises to use fiberglass under the mesh metal instead of plexiglass, but everywhere I have gone to buy fiberglass like that doesn't know what I'm talking about, and they advise to use plexiglass because it will not melt. Any suggestions on what else I can do or use to keep the snake from rubbing it's nose raw on the mesh metal?

