Would you please help me find clear, acetate sheets that are heat resistant and thick enough to be a card rather than just overlay a card?
Definitely an art / craft supply shop would be a good starting point. Alternatively, you could try and research on the internet to find a shop which sells what you are seeking.
Rubber Stamps, Craft ... ... of 10 A4 sheets of clear film that is ideal for glass painting. These sheets are heat resistant ... is 125 microns thick. We ... Heat Resistant Acetate (5 Sheets) Now only ?2.35
For the best answers, search on this site https://shorturl.im/ayg2G I agree with the other person just check with your friend or the person if possible before you do something to screw your project