Man this really has me curious...I'm thinking one of two possibilities for "papertowel" zim. Either the papertowel was used to make the imprint or the papertowel itself is the zim. 1-ply papertowels are pretty thin and if applied with alcohol or water, would adhere pretty good and snug down similar to what I can see in the photos. Seal with a laquer and then overpaint, it could probably work.
Help us out chief! Tell us the secret to this thing called "papertowel" zim...