You can see where on the Jon-Paul sample #2, and the bar vinyl #4, I did some destructive testing to see how the material tore and deformed.
Sample #2 thin aluminum took fingerprints, tore, folded, all with good memory (aka is remained over a week long period). Aluminum cold forms. Aluminum loses memory at about 1200 degrees.
Sample #4 vinyl tore with pliers only, would not take a fingerprint, would not hold a fold. Vinyl needs heat to develop a memory; Vinyl (a type of PVC) gets embossed at 280-320 fahrenheit depending on exact material.
As a reference point: commercial fiberglass can be re-formed and bent at about 200 degrees(like rubber at 200), however today special high temp products used with carbon fiber can take 300 degrees max.