Excellent resource. Thank you for posting it.
There is one thing to watch out for when looking for suitable film (besides thickness). Almost all treated polyester films today are subbed for solvent-based fluids. Without exception that I'm aware of (and there is an encyclopedia of things I'm not aware of), this means they are hydrophobic, i.e. shed and bead emulsion, and/or go all goopy and gloppy. You want to be sure to ask for hydrophilic subbing.