Well, technically it's an air-curing silicone rubber ... but you're right, actual thermoplastics like Polymorph are cheaper, don't expire and can be re-melted i

Well, technically it's an air-curing silicone rubber ... but you're right, actual thermoplastics like Polymorph are cheaper, don't expire and can be re-melted if you're not happy with a first attempt at something, or you want to reuse the material in a different project.