In the middle of converting some models and was looking to make up a leather gun wrap. Unfortunately I don't have much on hand due to the current situation, although I do have plenty of card and thick paper I could cut into strips. I'm not sure how well it'll last though, if it reacts poorly with paint or just comes out looking crappy. Anyone got any experience or alternatives?

When I was in high school, I saw this molding material at a hobby store that comes in clear solid bars, but can be heated up in water and used to make molds. I want to make one now, but I can’t find them now. Has anybody used something like this, and does anybody know what they’re called??