I just used regular old fiberglass, as you would get in a patch kit for cars, boats etc. Once it cures it seems fine. Fiberglass cloth and resin and wire mesh makes for a hellacious mess, however!
I keep my sankes in a "sterile envoronment". I just use heating pads under the aquaria. The substrate is just broken up slate....and I provide a water dish. This has worked very well for me. I have been keeping snakes for more about 42 years.