This video is the full comprehensive guide on a new process to produce highly chemically resistant membranes for use in electrochemistry applications such as producing acids or various transition metal salts from alkali salts.
for softer applications like fuel cells you do not need to use the PVC glue and directly apply PVA and citric on fresh cloth.
In terms of chemical resistance membranes seem to reach their limit when preparing HClO4 via NaClO4 but can easily prepare Cu(ClO4)2 from NaClO4 using copper anodes.
Other substrates such as fiberglass resin may provide better chemical resistance to prepare perchloric acid.