Use rigid foam insulation, which will provide a thermal break and not trap any moisture. Make sure you Tuck Tape every seam, and spray-foam all corners and joints to create a seal and a perfect thermal break.
Originally Posted by --You could have your cauldrons hanging above a fake fire, have something unexpected like a skelly climbing out of one, or fake witch legs sticking out like one accidentally fell in!
Christmas DIY: foam plumbing tubing foam plumbing tubing from home depot. Coil it and connect it with wire to keep it coiled. Spray paint it and attach it to a pvc pipe pole. Wrap in cellophane to make it a lollipop