Powertex beginners often ask about materials. Here's a guide to which materials work best with Powertex Universal Medium, why and what happens if we use something else!
The key guideline is to use natural materials. This includes
cotton fabrics,
wood,
metal
and glass.
However, there are lots more examples of materials that work really well.
Notably, plastics are generally a no, cured Powertex can peel off soft plastics so your project might not last. But any Powertex tutor will tell you that there are ways around this.
I recommend you check out this guide to Powertex and materials. It lists recommended natural materials, how to work with plastics and a note about organic materials. It's everything you need to know to dive into your stash and get started.
https://koresageart.com/blog/which-materials-can-i-use-with-powertex-universal-medium/
Happy creating!